Wow, I cannot even imagine the frustration that you must be feeling! How close is she to her 18th birthday? I think your anger is misplaced though, you should be angry with your daughter. You have no idea what line of BS she's feeding this guy's parents. If she was a bit younger I would contact the police and report her as a runaway. I can understand why she won't return to her father's but why won't she move into your place?