I 23F live with my roommate Kelsey 25F. We’ve been friends for a while and up until recently things were fine. We signed a year lease together, split rent and utilities 50/50, and agreed on basic house rules, no long-term guests, clean up after yourself, respect each other’s space. The issue is Kelsey’s boyfriend Mark He started staying over a couple nights a week, which I didn’t mind. But in the last two months it’s basically turned into him living here. He’s here 5 to 6 nights a week, he showers here daily, eats the groceries we buy together, and even leaves his laundry in our machines. He’s using our WiFi, electricity, and water, but he doesn’t pay a dime. I brought it up to Kelsey, and she got super defensive, saying Well, he’s my guest, I shouldn’t have to ask permission for him to be here. I told her a guest is someone who visits occasionally, not someone who’s essentially moved in, If Mark is going to live here he needs to contribute to rent and utilities. She accused me of being controlling and said I’m just jealous because I’m single. I told her this isn’t about jealousy, it’s about fairness I didn’t agree to subsidize her relationship. Last week I finally gave her options, either Mark starts paying a fair share, or he has to limit his stays. Kelsey blew up and said I was being unreasonable, and now she’s giving me the cold shoulder around the apartment. Some of my friends think I should just let it go because it’s not worth the drama, but others say I’m right to stand up for myself. I feel like I’m being gaslit into thinking I’m the bad guy here. So… AITA for putting my foot down about my roommate’s boyfriend basically freeloading?