Moving on but not wanting to hurt ex

Hey Reddit, looking for some advice. Sorry for the long post. 😅
I am a 27 year old, Pansexual woman who was last in a relationship with another woman (24F).
A little backstory: We dated for almost a year and a half and had been friends for over a year beforehand. When I fell for this woman, I fell hard. We loved each other so deeply and went through a lot together. We had a complicated (due to outside circumstances not within our control) but very good and overall supportive and healthy relationship.
A little over 3 months ago, I noticed she was acting just… Not like herself and not like the girlfriend I knew and loved. I tend to be very sensitive to changes in my partner’s behavior due to trauma and I had that awful gut feeling something bad was about to happen. I tried chalking it up to her going through finals at school and being stressed, but it was really hard and gave me huge anxiety.
Then one night, I went over to her place, feeling extremely anxious but tried acting as if things were normal. I asked her what was on her mind and she said nothing, she was fine. I knew things weren’t fine and I asked her again “hey… What’s up? Please talk to me.” This is when she broke down and told me that over the last few weeks she had been feeling us drifting apart (this was not on my end, I had not felt that this was happening but she felt it on her end) and that she thought a break would be helpful for us. I felt utterly heartbroken but I really wanted to respect the boundary she was putting forward and I could tell it was hard for her too so we set forth our “relationship break” rules, said goodbye, and I went home sobbing.
Over the next month, we barely talked. This is something she wanted, she said we would be there for each other if we needed but it would be best to not talk if we could. I was going through a very stressful life change during this month and it was very hard going through it alone and feeling abandoned by my partner during this really difficult time. I respected her wishes and as the month went on, she kind of dropped subtle hints that when we talked at the end of the month, at the end of our break, we would be getting back together.
The weekend before we had agreed would be our “revisit our relationship” day, she helped me move into a new apartment. We both tried to make it seem normal, but things were strained and awkward because, I, at least, didn’t know how to act around her. I wanted to be her girlfriend around her, like I always was but that’s not *really* what I was anymore. I asked her if we would be talking that day, she said “no, I still would like the remaining week.” And I respected that.
The day after, she sent me a message asking if she could come over to talk. I said yes and she came over and broke up with me.
Ultimately, she felt that it was a case of “the right person at the wrong time.” We were at different points in our lives and she felt she just really didn’t want to be in a relationship at this point in her life. Needless to say I was utterly heartbroken. Again, I was receptive to what she had to say and I didn’t fight her about it. I gave my end of things, my thoughts and emotions and it was a calm, though extremely difficult, breakup. We left on “good” terms but we have not really spoken since.
I spent a good amount of time to myself, crying and being heartbroken and just laying in bed alone and being sad. Processing. About two months ago, I was just at the point where I was feeling so lonely, I just wanted company so I went on bumble and started swiping. I met a lovely guy and we went on a couple dates and just enjoyed each other’s company. He’s been a fantastic friend and we both agreed that a relationship was not what we were looking for at the time.
A month ago, I went on a date with another guy and he and I have just clicked really, really well. I’m really enjoying time with him and getting to know him and we have “officially” started dating.
This is where I need advice. He tagged me in his relationship status on Facebook today and I haven’t confirmed it yet because I’m trying to be mindful. I firmly believe that my ex-girlfriend is seeing someone else and has been for a bit but hasn’t really posted anything because she’s trying to spare my feelings. I don’t have confirmation that she is seeing someone else, but I’m also not stupid. And I’m finally at the point where I’m okay if she is. I just don’t want to hurt her feelings by announcing I’m in this new relationship (which I want to do, announce it) and I’m trying to be mindful of her as well. Do you think it’s too soon to be public with something else?