Why is m ex being really mean to me after I broke up with him?

So I broke up with my ex twice. The first time I broke up with him was because he always lied. That time he begged and cried and wrote his wrongs.. I accepted him back and we decided to work on things. Here's the thing. He never knew much about me. Like I'd ask him fun little questions and he would get it right on the second guess. That next day he "apologized" by saying that all he can do is remember next time. Still felt it was a lame apology but whatever, I was really checked out of the relationship at this point because he neglected me emotionally. I've expressed multiple times that I dont feel beautiful around him (he made me really insecure). This took the cake. So the day we were on the phone I had accidentally sent him a message that was for someone else. They were both texting me the same time. The message wasn't bad or anything. On the phone he had asked in a confused tone, I answered because I'm honest and transparent. I never trusted him at first but the things he did broke my trust. He started saying "your business is my business" so I said okay, share your screen. He was confused and asked why.. it took him a while to do it. We had an argument. That next day I texted him "shouldve told you this lastnight, but I dont want to be with you anymore" he said "okay, over a share screen but okay. Should have left me alone the first time" I never responded and he blocked me. Now he's calling me ugly on social media and posting a out being in a relationship. After the last break up. He posted a qoute basically saying he will not be mending nothing between no one, f*ck them. It hurts to see "someone that loved you" act this way. Why is he doing this?

Why is m ex being really mean to me after I broke up with him?
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