Why do boys always have to make girls feel self conscious!?!?

I have a friend named *Lindsey* and she went out with this guy for a while after she had turned him down twice! Then after she started liking him, he broke up with her! Now she's been so depressed lately and making stupid statements about her looks! I could kill this guy and I was just hoping for some reurance from you guys that all boys aren't like this!