I just recently was in same situation but it was his sister. And I know she did it just to **** me off cause they used to be best friends. and were engaged now they had a baby together 7 years ago and were together for a long time and in the start of our relationship I found texts to her. And nothing after that but I have a right to not want him by her and his sister did it anyways. It is disrespectful. He's with you now not her. She should not be around.. the kid yes but the mother isn't needed. I would be pist... u have the right to be. Its just shi**ng on you
Well if it's his mom's house there really isn't anything you can do. I would say later after everyone is gone sit her down and let her know how you feel about what happened. Until then just keep cool and be cordial. Or maybe u and bf step out for minute for fresh air.