I have a deep seated insecurity about people not liking me and

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I have a deep seated insecurity about people not liking me and I feel like it's been affecting me a lot. There was one guy I was friends with whom I had a falling out with, but (I thought) we had patched things up before he left for another school. A few months later he had blocked me from everything, even game services he rarely uses. That was 2 years ago and I still hear about him occasionally from mutual friends and he tells them not to mention me at all. Originally I thought it was because I had posted a picture of a couple of mates wearing MAGA shirts as a joke for a school event (he apparently hates Trump), but I heard that it was something to do with something I had done before. The problem is, outside of that falling out, I don't know what I did wrong and I want to fix things but I can't seem to.

I don't know, I've been sitting on this for ages and I feel like it's become weird for holding onto it for so long and that I occasionally ask friends for updates/or mention him. It's just something that I've never really experienced before and I'm looking for help to move on.