Why do some men give very mixed signals to women?

Anonymous

A coworker who was very nice in the beginning but ended up hating me sometimes invades my personal space, touches me "accidentally" (like leaning his knee on mine during a meeting). One day, for some unknown reason, he started treating me extremely nice and encouraged me before Christmas break to call him on the phone to talk about "work". After new years I caught him staring and smiling at me from afar while I was talking with another coworker and he did not look away.

Why does he do that? Is he trying to intimidate me? I don't think that he is an asshole since everybody else loves him but I also don't see a reason why he would hate only me since I was always polite to him. I'm pretty sure he disliked me because he purposely avoided me, cancelled meetings without telling me and gave me dirty looks or avoided all eye contact.

Why do some men give very mixed signals to women?
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