What should I do? He won't talk to me?

After having sex with my ex bt things have been weird. The first week after we fought for two days because I blocked him and he said "if you don't want to talk to me or be my friend let me know and I won't hit you up again" Then the next day he asked me did I ever cheat on him while we were together (2 years ago) that conversation lasted a while. (I never cheated) After that we would chat here and there but nothing serious.

Now is is just really awkward. I tried talking to him today about my car (he's a mechanic) and he helped me but it was like pulling teeth like he didn't want to talk to me. If I start a conversation with him he doesn't try to keep the conversation going. I don't know what's up.

Should i I just forget it and never talk to him or ask him what's up?
What should I do? He won't talk to me?
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