Yeah, I've had it done to me by the guy before my current one. In that case though he thought he could be friends in order to then tell me that surprise-he had had a mistress and a girlfriend the entire time he was "more than friends" with me, and keep using me as some kinds of best friend/counselor who would somehow feel sympathy for him. And I did for a few months. And it almost destroyed me. So yeah. I definitely took lots of time to heal from that. I don't want such a shitstorm again but it seems like I walked into yet another bad bad situation.
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