I don’t usually get annoyed at people but when I do, I get annoyed/angry too much. How do I stop this and handle conflict better?

I’m (23M) almost always considered calm, collected, timid person by my friends and family. 99% of th time this is me. I always avoid conflict and just eat up even if something annoys me. However, eventually it gets too much for me and then I get really annoyed which leads to some drastic changes. I didn’t notice this before but ever since I started living on my own as an adult this has cropped up. For example, I was talking to a girl on Hinge for a month. We had a virtual date and she kept postponing actual date. I mever comfronted her about it. Then she was getting busy with grad school so messaging got infrequent. I still didn’t say anything until the point it got too much and I ended things. I thought it was fine then and it kinda was. However, I wish I could’ve told her my concern before going to final step directly. Recently it happened again with my research group. Althpugh in this case I handled things better but still, no one thought I had any problems until last moment when I decided to chmage groups. It again happened with a friend and I never showed any concern until apoint when I was too annoyed.

Now I’m talking to another girl. She’s also infrequent texter and she’s also away for lile a month. I’m getting annoyed a bit but she doesn’t know since I never show it. But I’m afraid that eventually it’s gonna get too much for me. I don’t wan t that to happen and instead work things out.

I just don’t know how to handle conflict. It’s not like things blow up. It’s just that I act such that things just end and I would rather solve conflict instead ending things.