what to do

So I think I'm starting to like my guy friend, but he has a girlfriend. He always makes, what seems like jokes, about having sex with me and how I'm hot and just stuff like that, and I guess eventually I started thinking about it a lot and maybe I started to like him when I didn't think I would before. What should I do?
Edit: I would never try to take a guy away from his girlfriend; I was more asking how I should feel because I'm a little confused. And also he's not saying those thing seriously, because I know he's joking but still..

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