A few months ago I've made a massive mistake by replying to his FB message - because he put a lot of effort into it and so on. We talked quite a few times since then but I was just trying to be friendly, I talk to tons of people on fb and insta. But I think he got the wrong idea. He's now acting as if we are good friends (or more because he's often jealous and possessive even though he knows I'm taken!) and it's annoying as hell.
He won't stop messaging me, he constantly sends me pictures, he won't shut up about his problems, and daily life, crap like what he's been up to etc etc etc. I've been doing everything in my power to discourage him, like super short replies, showing that I don't give a ****, not replying for daaaays but it's not working. I think he might have some kind of mental problem.
I'm too nice to block him, though, because he hasn't really done anything bad. But I find him so clingy and disgusting. I'm getting stalkerish vibes from him, too, which terrifies me. What do I do? I want to block him but I'm too nice to do that. How do I discourage him from talking to me if ignoring him isn't really working that well?