My (19f) boyfriend (20m) was hanging out with his lady friend, drinking and having fun, it ended up at her place and towards the end of the night she kissed him. When he came by the next day, he told me and honestly I am furious. I had my suspicions about this girl but he really wanted to be friends with her. But because of arguing and the trouble I was getting for feeling that way I gave up and was starting to trust her but this incident threw all of that away. He doesn’t want to stop being friends with her, even though that he told me that he was going to talk to her about ending the friendship. AITAH to put my foot down and tell him to either stop being friends with her or break up with him. I’m really trying to be understanding and patient but at this point it just feels disrespectful. I want to try to do this peacefully but it just doesn’t seem like there is another way.