If you tell her that her boyfriend is putting leeches on you she will probably dump him and marry you.

Or, on the otherhand, you could take the good advice and leave her alone because you're not going to win her away from him (setting aside for a moment that it's a douchey thing to do), and she's much better at playing this game than you are (as evidenced by the fact that you're posting here.)

Go find someone else, idiot, you're a sophomore in college. Go join a fraternity and get this idiotic idea hazed out of you. Do something cool instead of trying to text girls with boyfriends