Why does he acts like this?

I’m so tired of this guy he can act super friendly with me for 2 hours and then tell me that he hates me and that I’m ugly he is mean like 3/4 of the time but I’m almost sure that he stare at me.
I tried to ignore him but when I do that he is even more mean
I don’t care if he hates me but why does he act friendly sometimes
I don't know what to do to make it stop he has been like that for 2 month now
Why does he acts like this?
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