Maybe this is too broad of a question but does anyone else like latch onto some random person as like the worst person ever, even if they're not someone close to you that you would split on really

For example, I met my ex through a friend of mine while they were dating for about a month, purely online and it didn't really mean much to either of them. But after they broke up and I started dating my ex, I got OVERWHELMINGLY jealous of (my friend) to the point where I would cry if I thought about her and I ended up blocking her on all social media with no explanation and not engaging with anything that reminded me of her, like even hearing her online name (literally just a normal, common word so I would hear it a lot) would make me feel sick. And she had done nothing to me, she was the one who broke up with my ex to begin with and she didn't care that we were dating after, but her just existing would set me off so bad

I'm doing it at the moment too where my friend group has a new person in it, and they're fine like they're a perfectly nice person but something about them acting like we're closer than we actually are set me off and now I haven't spoken to any of my friends for days and it's so annoying like I KNOW I'm being irrational but suddenly I'm like oh okay this person is a demon and I bet they're secretly dming everyone about how I'm the worst person ever and I should die

But even when I'm not doing this I'll always have at least 1 person I passively see as like "the enemy"