Prevention against attacks and false information?

To make a long story really short I was friends with a group of people for a while. We had a hard falling out and they started turning my friends against me and “crashing out” as is the term nowadays. Back then I didn’t exactly have the largest following but since then my following has grown significantly. I blocked them on all socials and they blocked me and I thought that was that. Then I had forgot that I left one of them unblocked. Come to realize that the one person had screenshotted our Snapchat conversations. Of course out of habit I asked why they did it, they didn’t respond so I blocked them since I forgot to do that in the first place. There wasn’t really anything out of the ordinary to those texts anyways. I’m honestly just trying to move on from them and grow my own following and since they are literally blocked on everything I can’t access any screenshots to defend myself. They were and apparently still are toxic and haven’t moved on . Am I over thinking this?