Girl(W28) I(M32) date and want to visit in April in Japan(Sendai) acts really weird and distant and then I get suprised by another person(W25). What should I do?

Hello dear Redditors! Sorry, for my bad english!

I(M32) from Austria am dating a japanese girl(W28) from Sendai for more than 4 months. First this situation started out as a casual talk on an App where girls message you first after you both match.
In the beginning I already was pretty impressed by her long elaborate intro text where she put so much effort in that you could instantly see she took a lot of time to write about what she liked in my bio.
From that day on we both messaged constantly every day. The text were long and full of many things we connected on. She explained a lot of stuff to me about Japan (a country I didn’t think much about) and it’s culture. Over time and a little bit of research on my side I slowly grew to that culture and found some interests which made me like that country more and more.

After a while we started to talk about dating and what we wanted for ourselves and what we expect from the other person. It was pretty much the usual stuff. What I liked the most was her way of explaining to me how much she disliked cheating and that she aims for a good relationship and later on a marriage with kids, where she also wants to be a provider, while fullfilling her dream to do most of the time a hobby where she helpes people in need in a group.

After that we started flirting, called each other or camed for many many hours. We would laugh smile and enjoy each others presence even if we were separated by a long distance. It felt awesome to finally have a girl in front of me who is nice, listens to me, tells me every day how much she likes me and simply gave me a feeling I lost a long time ago. True passionate love!

Than we started to talk about meeting each other, how much she wanted to see me and hug me and lay next to me. I than had to tell her that I needed a bit of time to get the money to visit her in Japan and also if we wanted to go for a bright future as a couple we should plan to move together at some point in the future. She agreed and told me that she feels that way too and didn’t want to wait many years to marry and have kids. I didn’t comment on that.
I than said I need 1-2 years to move to Japan, because I have to work actively for some things to fullfill the requirements for applying for a Visa and being a valuable worker in Japan.

That was the moment were she became weird. She started to say that she feels bad and sad to know that we than need to have a long distance relationship. We couldn’t see each other every week but also every time I have to fly back she’s scared and very sad, because I’m far away for many months and she always has these experiences from past relationships in her head where she got cheated on and has to fight those feelings that I won’t do that too.

I comforted her the best I could and made sure to be a good empathic guy on which she can depend on without having to panic about me and what I do.

But the downward spiral still continued on and she became more weird over the next days. She started texting me less and stopped saying good morning and also good night. I started seeing her being online on a dating app again, were she was the whole time inactive before. (She explained that her being online was because of just reading stuff). Only the calls were always consistent. But they were much more filled with her worries and that if we want to enter the relationship she needs to see me first to feel save and find power to handle the LDR. Of course I needed to see her too before I ask her to be my girl and since I saw her sad face I thought I will do that as fast as I can and instantly said: “We going to meet in April. I will be there for 3 weeks and you have all the time to get to know me. I will not try anything like others would do (regarding intimacy). I just want you to feel save and see that I’m a loving caring man who you can proudly call in the future a good boyfriend!” She instantly lit up and cried of joy and had that spark in her eye like I’m to most precious person she ever saw.

Time continued on and she messaged me a lot how she will go everywhere with me. But after a while a call took me of guard. She talked to me and said she doesn’t know if she can enter the relationship instantly when we meet in that time. The LDR freaks her out and she isn’t a person who writes much and wants to call only one time a week because of her work and that she needs many days of being lazy and do stuff alone.
She also doesn’t want to tell me if she goes out with her friends or why she hasn’t time on a weekend to call. Same goes for her sunday meetings with a group, where they want to help poor or mentally weak people. Which btw she really wanted me to be a part of but I denied because I don’t want to be a part of a group I don’t know and didn’t find infos on in the internet.
I was confused why out of nowhere she tried to be so secret about things and acted weird on normal questions. I consciously behaved in a easy-going way and didn’t ask her in any way to tell me everything she does, because I’m way to busy with work and I just trust her without questioning much.
I’m completely chill with everyone, don’t talk much and I’m the opposite of a pushy person because I don’t like pushy people myself and know how bad their behavior can be received.
The only case I asked her something to do was when she went somewhere special and I told her to tell me when she gets home, so I know she’s save.

So further down the road everything was different.
She didn’t compliment me anymore. She was constantly online on dating apps and saying she doesn’t write other guys only me. Didn’t message me often (maybe one time a day). Came too late to calls we agreed on with the reason that she was lazy and forgot the time. Found problems in my facebook friendslist because there were too many women (Well, Family, old Classmates, old Uni friends, (Ex-)Coworkers, Girlfriends and wifes of my male friends etc., can be many women) and accused me that I could be a guy who plays a lot around with woman, even though I didn’t write any women after falling for her and even cut contact, in a polite manner, to other very interested girls, because I focused on her.

4 days ago it completely went into the ground. She called me again late. Told me she doesn’t like to write me every day. Than informed me that when we meet in April she will not want us to act as boyfriend and girlfriend but just as friends, that we only maybe meet 2-3 times a week and also she doesn’t want me to be in her home or hug her. Than she asked me pushy why I don’t want to join in her sunday group and apologize in the next second because she feels she’s rude to me and thinks she hurts me. Afterwards she accused me again that my friendslist is way too much filled with girls and that I want to date them all. I was annoyed again by that stuff.
What than followed from her was weird. While we talked on cam she looked at her phone with a big smile. I found that weird because it looked like the face my sister makes when her beloved husband messages her. When I asked why she smiled at her phone she said it was nothing. I than jokingly asked her “Do you talk with another boy?” And she reacted like I took her completely off guard. She opend her eyes wide and said many times in a high pitched stuttering voice “NoNoNo!” While swinging her arms in front of her face. After that she went silent and asked if we could hung up a 1 hour earlier because she wants to do something.

Two days after I got out of nowhere a message(actually the 1.time in 4 months) from one of the in me interested girls from the past, who suprisingly shared the same mindset as me in a lot of ways, but I had cut of. She wrote me out of nowhere a long text on Whatsapp, if I’m still single and that she doesn’t get me out of her head, she liked my personality so much and our long conversation back then really felt like I took her serious as a woman, shared a lot of interests with her, always were kind and she wanted to let me know this before it’s too late and she loses me completly without trying. She (W25 from Osaka, Japan) even added on that she would fly to my country just to see me to prove what she feels and would take all her 10 vacation days off.
In that moment I felt myself starting crying, a thing I normally didn’t do at all. But when I saw these nice words I couldn’t help myself after so many weeks of felling hurt it was like I felt appreciated for what I am without mistrust and else.

After that experience I feel right now really confused. I don’t know what to do!
I couldn’t reply to her heartwarming message, because I’m really a person who doesn’t cheat on the girl im committed too and stand to my words. But in some way I see my past self in that young woman, who messaged me, and want to see her and her commitment towards the person she likes win.

What do you think?
How should I go forward with the girl I commited to and who grow so weird towards me?
Should I cancel the 3 week trip?
What do you think were the mistakes I made?
And how should I react or not react on that message I got from that woman from Osaka?

TLDR: I[M32] commited myself to a japanese woman[W28] who planned her future with me as her boyfriend only to be put in a weird boyfriend-justfriend-state after I tried to treat her well. And then another japanese woman[W25], I cut of,
comes out of nowhere, makes me cry because she treats me well and puts the same effort into me, I put into another woman.