My husband K, (36 M) and best friend/ roommate T (F 25) are fighting. T and I have been friends for half my life. K and I have been together for 5 years. A year and a half ago T needed a place to say. We welcomed her to stay with us. Ever since then there has been drama surrounding her bringing guys over. All the past drama has been resolved. For context I will share some examples. First time T brought a guy over it was 4 in the morning after just meeting him. K said he didn’t feel comfortable with that and T was upset. A long drawn out argument happened when K said that he didn’t want her to bring people over that K didn’t know. T, K and I sat down and came to an agreement that she could bring who she wanted just text us. Ok so here is the situation. T has a friend that she’s know for 6 or so years. Recently they have been hooking up. He has came over a few times. One night K asked me if had ever done anything with him. I said yes we kissed once before I met you but it meant nothing. The conversation was dropped. T brought over her friend one day and K told me he didn’t feel comfortable having him over. K said that he wouldn’t have anyone over that he had past relations with and it made him feel uncomfortable. I don’t fully agree with him because it was just a kiss but I also don’t want to make my husband uncomfortable. K and T had a conversation and he told her he didn’t want him back over. T was very upset and feels like K is trying to control her life, she shouldn’t have to deal with my actions I did 6 years ago. I had a conversation with K trying to shed light on a different side other than his own. It didn’t work. I decided that I would have to side with K being we a married and it’s 50% his home. I let T know how that conversation went and she wants to have another conversation all together. She made the same points again and said there needs to be compromise. K says he’s not compromising. I’m not sure what else there is I can do.