Break ups/ messy/ plz help/ overthinking?

i saw my ex yesterday unexpectedly on the bus on the way home and it triggered me, we stopped talking abruptly and it didn’t end well, i felt immediately guilty for feeling like that and i told my boyfriend. today i thought about it too and felt this strange unsettling feeling, i feel guilty even thinking about it, i just want to stop thinking and ruminating, i was like “what if i wanna go back with him? why do i keep thinking this?” and i felt horrible, i just want some rest, what do you suggest? does it happen to you too?

Ok I need any and all advice 😭 please help. I’ve been with my boyfriend for over 2 years and feel deeply connected and happy and in love with him. My ex and I were first loves and on and off basically for 5 or so years until I met my current bf. During that time we both were toxic and back and forth and he did some things that were really hurtful. We never really had an “ending” or any actual closure to anything? I just kind of started talking to and liking my current boyfriend. I saw my ex a month ish ago at the bar and wasn’t very nice to him. I was like hyper aware of how I was behaving around him to make sure he didn’t get the wrong idea. I know he has had a really hard time moving on from me. Since then I feel like I have not been able to stop thinking about the past and am questioning a ton about my feelings. I do have ROCD, and I don’t know if this is solely because of that or a mix of that and the emotional loose ends? I don’t know. But I’m feeling such an urge to text him this whole paragraph I’ve drafted about closure, how I don’t even need him to respond, but I just need to get some things off my chest. I feel SO conflicted about sending it. I do not want to rekindle anything with him, but it’s just the principle of texting your ex that makes me feel like I am betraying my boyfriend now. Yet it feels like it’s weighing on me so much - and I’m like is ocd involved? I just don’t know if I should send the text or not. If anyone has been in similar situations or has any helpful advice I would really love and appreciate some because I feel so stuck.

I’m overanlazing alot of things. My first post on my profile covers everything but I’m so worried and like nervous reck of what my ex boyfriend could be doing. We are on no contact for almost 3 weeks now which is the longest we’ve ever gone. I’m getting so much into my head like if he already moved on, or if he’s talking with some girl already, or letting a girl hit on him. Or even going back to bad habits. It’s been driving me nuts for the past few days. I’m still mad at him for hurting me mentally but miss him too. I keep thinking there’s something wrong with me, wrong with the way I’m thinking, like I’m not normal for thinking these things. That he’d find me weird I wonder those things and that I check on his profile on instagram, just staring at it, blocking and un blocking him. I worry that maybe he doesn’t think of me anymore. And he just. Doesn’t care. I feel like an older version of him would say I’m being too much, that I’m overthinking to so many extents that even tho we are broken up, he’s single and so am I and I shouldn’t care this much about it. But I do. And I’m sure it’s because I’m still in love with him. Even if I’m mad and upset still.