Why do some men reject very pretty women?

Anonymous
My cousin is like super model pretty and one guy she liked for years used her sexually but would never commit to her and he told her she will never have him. He ended up married and with a child by a very unattractive girl. I find this so strange because he still tries to contact my cousin and he even contacted me and asked me where is she. My cousin went through a bad depression, but she’s moved on. My question is why does this happen often? I see it at night clubs too where the plain looking chick gets hit on the most.
Why do some men reject very pretty women?
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