Is my friend just obsessed with this girls looks?

You sound a bit jealous. You like him, and he seems to like another girl, and you don't seem too fond of this here girl. It's jealousy, don't worry, it's a natural human emotion when it comes to your crushes. I just open a can of whoop whenever a guy talks to the girl I like, and he knows that I like her. If he don't know, then I don't care. Just tell him to back off.