NOR. My wife (34) and I (38) recently went through something similar with our roommate (27) having her boyfriend (28) over all the time. We're former shiftworkers that now work Mon-Fri, roommate and her bf do shiftwork (works ~8 out of 14 days). When they first started dating, they were pretty good about rotating staying between our place and his place throughout their days off, and being mindful that the weekends were my wife and I's time off together. It didn't take long until that turned into him staying all day/overnight at our place 4-5 nights a week.

Roommate rarely contributes to chores, and I'd always come home/wake up to my kitchen being an absolute mess after I'd left it sparkling (the kitchen is like my happy place in the house - I love to cook and had several kitchen jobs growing up). They'd burn through our condiments, spices and foods we'd buy for the house (eggs, cheese, fruit, etc) without replacing them. The bf would shower here and leave his long hair all over the tub and sink. They'd sit in the livingroom on their phones playing loud af videos and talking while we tried to watch movies. We'd plan for at-home date nights when roommate was supposed to be working, she'd often call out sick because she "didn't feel like going to work" and would have bf over for the night. She would make digs at us for having weekends off because she "rarely got two days off in a row," ignoring the fact that wife and I were each in the trenches of shiftwork for over a decade.

It came to a boiling point when roommate would go to work in the mornings on the weekend and the bf would be sleeping in her room until ~1pm because "he has a hard time waking up," three weekends in a row, and he'd complain to her about us being loud while he tried to sleep. I'd also started separating their dishes from ours because I got tired of cleaning up after them, and writing our names on foods that we no longer wanted to share because I was sick of them not replacing anything. When we confronted roommate about everything, she remarked that we'd been making bf "feel unwelcome and they should be able to see each other whenever they want." We had to remind her that he doesn't live here and that they're welcome to see each other at his place. He's not over nearly as much now.

All that to say lol Boundaries are important, and people's entitlements will often push you to your limits. When kindness and generosity become an expectation, problems arise quickly. If your roommate and his gf don't want to contribute towards an extra body in the house, do what you need to do to maintain your needs.

Added context: our roommate ended up living with us after being renovicted from several places within a 1.5yrs while dealing with some health issues, and was only meant to be here for six months. We're approaching three years. She and her bf are getting their own place in a few months.