Why do some guys put me down?

I was seeing this guy that was perfect at the start. Then he started making fun of the way that I looked and telling me how he could never see me as his girlfriend. He told everyone that everything that happened between us was fake. I used to talk to him everyday because he said he had depression over his ex who broke up with him 10 months earlier. He isn't the first guy who has treated me poorly. Why are some guys like this?
Why do some guys put me down?
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