Why is this guy obsessed with me? ?

I told him that I’m not interested five or six times, and he still won’t go away. I’ve blocked him because I thought he was too needy. He’s jealous of a guy that I dated and like from work. He told me that he didn’t think he was the right guy for me when he barely knows me. I don’t get why he’s so obsessed with me when there’s guys girls that look just as good if not better than me at work.
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I just don’t get why guys obsess over certain women.
Why is this guy obsessed with me? ?
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