girls I need a second opinion..

So I'm with this guy in his house. We've been going on dates for the past 3 week. But we've been friends for 2 years. We're both in his room, on his bed watching tv and his EX girlfriend walked through the front door and started begging him to get back with her. She came into his house, uninvited. Apparently the door was unlocked and no one else in the house saw her walk in. He was yelling and screaming at her to leave and she was trying to put her hands on me. What would you do? The guy that I'm dating said that he's so sorry and he didn't know she was going to do that. What should I be thinking? 😞😔😔😔😒