Why did he do all this?

Why would a guy at work hit on me in sexual ways when I never dress sex or revealing and I dont use makeup and I am quiet and tell him to shut up if he talks sexually? How can he see me as a pump and dump when I do all this and dont do premarital sex

Also he says "I know aomeome who might wanna date you in the future"? He has a girlfriend and I said "who is it" but he won’t answer.
Why did he do all this?
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