AITA for having loud sex once?

This past week was my boyfriend (20M) and I’s (20F) 4th anniversary! We had plans Friday night to go out to dinner to celebrate and come back to my place and hang out. My roommate (21F) knew this, as we had talked about it early that week. Friday night comes, and my boyfriend and I come back and go to my room after saying hi to my roommate. After a little bit we do the deed, and after I check my phone to a text saying “Hey I’m trying to sleep”. I immediately panic and am like oh my god I can’t believe she heard us I feel so bad. I text her back and am like I am so sorry! Due to the embarrassment, my boyfriend and I leave for his place as I didn’t want to risk her even hearing us talking since I knew she wanted to sleep. I thought that that would be the end of it, as I apologized and she never responded. However I was wrong.

The next day I’m doing dishes when she walks in and immediately says to me “Hey I just want to clear the air”, and I’m like oh good there won’t be any bad blood, but oh was I wrong. She continues “I thought it was common courtesy to have quiet sex if you know your roommate is home”. My face drops and I immediately start apologizing again, saying that I truly am sorry and I did not think we were being that loud, but I guess we were. She then says that oh we definitely were and it was disgusting. This really caught me off guard because I have heard her having sex multiple times and have never said anything. I just continued to apologize, and she walked away. I literally am tearing up because how did I not realize our sex was truly this loud to make her so mad at me, because genuinely thinking back I don’t think we were, but she wouldn’t just make this up so I guess we were? A little time passes and I go back to my room, but as I’m about to enter, she comes out of her’s and looks at me saying “Is that why you guys hang out here more now?” (Background: my bf and I tend to hang at his place but he’s come over about twice a week the past three weeks due to personal issues) and I am just like what? And she repeats herself and I finally understand that she’s asking me if him and I hang out here because his roommates complained about our “loud” sex too much. I, again, am shocked, because who asks that? I just say no, and go in my room. I feel honestly offended, because why would you act like this?

This is the first time I have done anything remotely negative to her, yet she seems to be really upset. I totally understand being annoyed that we were having louder sex, but I feel like she shouldn’t be treating me this way. Maybe I am just a bitch, but I apologized a million times but she kept saying disrespectful things to me instead of just being like hey, I know we talked last night, but if you could just keep it down and I would have been like no worries, we definitely will. What do you guys think? Am I the asshole?

Edit: This is the only time she has ever said anything, as my boyfriend and I are rarely ever at my apartment, and half the time we are she isn’t home.