Why my guy friend enjoys hurting me?

It is interesting for me. What makes a guy to be kind, friendly and respectul to all his female friends but abusive to his one female friend? I did nothing wrong to him. Also we are very similar to each other... We are in no contact for months, I did not see him for a year. He still watches all my stories, wish me happy birthday, when something important happens to me he told about it to others.

What could cause this guy to act like that? Maybe trauma? He often says ,, love does not exists".
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Why my guy friend enjoys hurting me?
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