Why would he reject a perfect girl?

What could be a reason why a guy would not want to date a girl who is physically beautiful, is really cool and has a great personality, has the same "social status" as him, mutual friends, etc. and the guy is well aware the girl totally wants him...?
Updates
+1 y
And he has no other girls that want him and he is not taken
Updates
+1 y
By "perfect" I mean perfect for him
Why would he reject a perfect girl?
Post Opinion