Guys, what makes you obsess about a woman?

There is this guy who according to a mutual friend, talks about me constantly. Anytime this guy sees me he stares either smiling and blushing or he just stares. My friend says he thinks this guy is obsessed with me. What reason would guys have to be obsessed with a woman? What makes you obsess about a woman?

Guys, what makes you obsess about a woman?
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