Why is he being like this? Why is he so mean?

Guy told me I was beautiful. today he got mad and said I’m ugly that he only said I was beautiful because he was bored. But in reality that I’m ugly and that he has a lot of fine women after him that are productive and with big asses. That he has other options. I told him then go with those females and he said yeah the ones that are the one that is light years away from you? yes.
Why is he being like this? Why is he so mean?
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