should i block him?
why did he unblock me if he didn't want contact?
Because like I said, nobody wants to have to block someone. It's like requiring a restraining order on someone. You sort of hope that people can stay out of each others lives without having to go that far, but given your question, maybe he needs to keep you blocked. Block him if you want -- it's probably good for you.
he cheated on me, lied about it for a month, dumped me, had sex with someone else right after, told me he still loved me, admitted to using me for sex, then did that
You need to block this guy and stop obsessing over him.
any chance we will get back together?
Yes, if you let yourself get used by him again, he'll probably eventually take you up on it.
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