Why does my ex boyfriend trash talk me?

Anonymous
Ok so, my ex boyfriend dumped me about 4 months ago because he lost feelings for me. I think I handled the breakup quite well as I did not ask for him back, nor did I try to do anything. In fact, I joined a gym soon after, started going out more, started caring about myself physically and mentally. When we spoke a month later, he asked if we could be friends and I declined as I knew being friends with him would not work out as there was quite a lot of unresolved issues. For the past 2-3 months, I've walked past him trash talking me, I've heard him trash talking me, I've heard from other people that he's been trashing about me, and he has even done it while I was in the same room as him. For 3 months this has been going on. Now, I've tried my hardest to avoid him as much as possible; I try not to hang out in the same area he is in, I leave the room when I hear him talking about me, and I try not to talk about him either. So all in all, I have not spoken to him in 3 months. Yet, he called me "crazy" now this makes no sense since I've basically pretended like he doesn't exist and haven't gone trashing talking him. So on what basis is he calling me "crazy"? Can someone please explain to me why he feels the need to constantly trash talk me when I haven't actually done anything wrong to him? Please don't say things like "you shouldn't focus on his actions!" Etc etc, I do know that. But I'm finally speaking about this after 3 months. I just need some insight.
Why does my ex boyfriend trash talk me?
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