Apartment Sharing Issues

Sa
I live with my boyfriend and a close friend of ours. This close friend, we'll call her Anne. Well, Anne has recently acquired a boyfriend of her own. She hasn't had one since early in high school. Now, you might not think this is a problem but my boyfriend and I feel awkward about this because he comes over to our apartment quite a bit. She's been with him not even 2 weeks and he's come over every other day or multiple days in a row during the week when we have school. Now, my boyfriend is extremely uncomfortable when he's here. He's got issues with guys his age - he was bullied a lot in school. We normally stay in our bedroom when he's here because anytime I walk in the living room or anywhere, it's extremely awkward. Both of us feel like we can't be ourselves in our own apartment when he's around. Maybe it's because we have anxiety issues but it's really starting to affect both of our studying habits. She'll tell us the day before or right before he comes over. Idk how to approach the situation or even begin to tell her how we feel and I have no clue of any solutions as to how to fix it. He comes over during the week because he works weekends and she's in school all week, so it's easier for him to come here. They never go out anywhere, they always just watch TV or Netflix in the living room or her room. It's really beginning to stress the both of us out. Please help! Any advice is welcomed!
Edit: She is very finicky on paying rent. We wouldn't get a dime out of her if we didn't ask all the time. Every piece of furniture in this apartment excluding the furniture in her bedroom belongs to me or my boyfriend or things we bought together. I have known this girl since grade school and my boyfriend since they were little because their dad's are friends. They use our Xbox, our tv, our everything.