How do you deal with getting blocked unnecessarily?

I’ve been in a complicated situation with someone I once cared about. We were in contact for a while, but things started to go downhill, and at some point, we drifted apart. We didn't talk for a bit, but then unexpectedly, they reached out and we had brief communication. However, after that, I suddenly got blocked on all platforms without any explanation. The conversation that we had wasn't even anything significant and it was then who reached out.

It’s been months since then, and although I’ve done a lot of personal growth in that time, I find myself often fantasizing about what I would say if we ever talked again. I think about how I would clear the air, share my side, and express all the things I never got to say. Sometimes, I imagine that conversation in great detail, but I know deep down that it might not change anything and that reaching out may not be the healthiest option.

Has anyone else been in a similar situation where you’re constantly imagining what you would say to someone, even though they cut contact and blocked you? How do you stop the urge to fantasize about those conversations when it doesn’t seem like it will help you move on? I just have the urge to let him know that what he did to me when we were in contact was not justified and i deserve better.