Get out of Dodge and give them the silent treatment for as long as possible. Keeping your dignity is key here. If you react by busting his face in then the twerp will probably inform the police. If he is shaddy enough to go behind your back he will probably be more than willing to grass you up to the Cops. + to the on seeing eye, it will make you the topdog. Everyone will sympathise, it would be no good to read in the paper how some jelous man broke his girls face in with a hammer. Delete all contacts, emails, facebook and so... surrounding her existence. Considering you were so for her it will take a long time to get over but it will happen. Believe me i know, lets just say iam an expert in this field. Head up champ, these are just words you will be scanning over atm. But hopefully they will hit home soon.