[Skeleton]

If my dad did that, I'd feel the same as you. Have you told him how you felt about it? If you're working to try and patch things up, talking to him about this could help that but if you feel that because of this, you don't want to try anymore then tell him that because there really isn't much you can do about the situation with your father and his potential girlfriend so the only option is to talk to him about it and decide whether you want to stick around and carry on attempting to work on things or leave.