Hmmm...i'm not sure how old you both are. Both her behavior and your reaction seem very childish to me. Honestly, what she did, is really no big deal, it's your relationship that actually worries me. There seems to be a lot of "possession" involved and that is never healthy. I'm with dyermaker concerning the "leash" issue..
While I agree that the person's personality is more important and looks fade, you still need some initial attraction. Wait until you meet a guy with missing teeth and I think you'll change your tune. Honestly, it's not a bright idea..