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Then the last time we dated he told me he cheated on me with this girl he worked with.
After all those break ups, and now this.
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I was devastated, and I asked him why would he do something like that. He told me he wasn't in love with me anymore. I stopped talking to him for a few days and he started calling me.
That should have been the end of this mess right then and there, as his actions say he doesn't love you, as well as his words.
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when I talked to him he told me he had sex with her.
DUHHHHH!
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as bad I as wanted to say something I couldn't because we weren't together when they did, but it still hurt really bad.
Of course it did, and not expressing your feeling about this whole situation was a big mistake, on your part.
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I'm still talking to him as a friend. We still have sex, he's not with her, but he still treats me like I'm his girlfriend. He's sending me mixed messages.
He isn't sending mixed signals at all, you are accepting his bad behavior, and rewarding him for cheating on you.
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he says he doesn't know why he can't stop having sex with me.
Oh, come on, you do understand, you keep letting him have it free, and he takes it.
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I try to tell him that I feel used and like a doormat but I cant. I don't know what to do, or what he's doing.
After telling him, you do nothing to back up your words, with actions. Its not so much what he is doing, it's about what your not doing. Kick him completely out of your life permanently, and heal yourself, and learn from this experience, then it won't matter to you, what he is doing, or why.