Hi! So I (25F) have been dating my boyfriend (25M) for a little over a year now. Around the time we starting dating, his best friend (24M) started dating an 18 y/o girl. The both of us felt this was weird and just an uncomfortable situation all around. But my boyfriend and his best friend have been friends for 10+ years and we both really enjoyed him as a friend. He had been going through a hard time when they met so we both just tried to support him. Over the past year, she has shown us that her mind set really reflects her age and it’s becoming really hard to be around both of them. They have argued around us before about things she’s insecure about and it comes off very irrational. We’ve heard her call him names like btch, assh**, etc. and has taken his phone and pinched him when he wasn’t ready to leave when she was. Now, on my birthday, my boyfriend’s bestfriend came out with us to the bars and said multiple times he wanted to stay the night if he was too drunk. At the end of the night around 3 am, he was knocked out on our couch but we saw he was mid text to his girlfriend. I decided to call her and let her know he was okay because if my boyfriend went out drinking, I’d want to know he was okay. She then got pretty upset saying she was coming to get him and we had told her we didn’t think it was a good idea, that it was late, he was out cold, and he said he wanted to stay. This led to her showing up anyways and barging into our apartment without knocking. (Edit : We typically always lock our door, but my boyfriend had forgotten this night due to all of us just getting home from ubering back from the bars.) This led to a heated argument between us before she dragged him off the couch and took him outside and home. Now I’m kind of in a position of feelings like an asshole, but also feeling justified in being bothered. I never want to make a woman feel less than, and I want to support my friend in his relationship as long as he’s happy. But it’s getting hard to want to be around her and also getting hard to respect my boyfriend’s friend. Am I wrong for feeling weird about him being okay with dating a girl that much younger than him? And I overreacting about the birthday situation? I have apologized to her for any tone I had during that situation but I don’t feel like I owe her an apology for being upset about it.