pushing over my limits

My roommate and I have been getting along pretty well by giving each other space while we work during the day and maybe watching an episode or two of something at night before going to bed or taking solo social distance walks, but her boyfriend now has to drive halfway across the country to his parent's and she wants him to stay with us for a little while. I said yes as long as it's only for a few hours so he can take a nap and then keep driving and then we have to deep clean the house when he leaves. Our walls are thin and I can hear her trying to explain to him on the phone over and over why people are taking so many precautions with this virus. Apparently he was still going out to bars this week. If I get sick because I hate confrontation and can't say no I'm gonna be so pissed.