I met D 3,5 years ago, while I was with my first boyfriend. We started talking a lot, but we were just messaging online bacause he was studying abroad (while I was still with my first boyfriend). Nothing happened between us, but I broke up with my boyfriend 1 year after I met D, and we were able to meet up a month later, and we hooked up, talked it out, and started dating. It was very long distance, but we managed to meet a couple of times in a few months. Then my mental health started to get bad, and the distance was hard, and I got a stupid crush on one of my friends, and I decided to break up with D. I was fine, focusing on myself, and in the last 2 years I dated a little here and there, but a few months ago I started thinking about D again. I thought I was just lonely or nostalgic, but it didn't stop. I messaged him a couple of weeks ago, just wanted to know how he was, to hear from him. We've been messaging a little since then, just about our days sometimes, or sending memes. He's had a girlfriend for a long time now, but from what I understood it's not a good relationship, and he talks about other girls, too (quite a lot, actually, for some reason) (just crushes and stuff). Anyway. I don't want to break up his relationship or anything, he deserves his life and it's not really my place since I gave him up. But I can't stop thinking about him, about what we had and how I didn't have anything close to it with anyone else I've been with. I miss him, I miss what we had, and I don't know if I should stop talking to him and work on moving on. It feels stupid, being sad over a break up I initiated 2 years ago. I don't think pursuing him is an option, like, I was the one who gave him up, and he's moved on, obviously. Idk. I don't want to tell him any of this, because it doesn't seem fair to bring him back into it after he made a life for himself without me, but I miss him so much now.