Why does my ex boyfriend lie?

Me and my ex broke up. I wanted to get back together and he wouldn’t give me a clear answer so I started to go on dates. He eventually told me we weren’t going to get back together anytime soon so I told him I’m going to block him in order to move on. He was a bit annoyed with this but wished me well and told me to message him if I ever need him.
The other day I found out he’s been telling people he hates me and the breakup is my fault. He says I told him I’d put effort into the relationship and then started seeing someone else. I’m so confused because that isn’t what happened. And he didn’t say he hated me before I blocked him so why’s he suddenly started hating me now. I’ve not said anything bad about him. It makes no sense to me
Why does my ex boyfriend lie?
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