AITAH for saying the way my bf talks to his sister when he's drunk is weird? I (19F) and my boyfriend(21M) have been together for about three and a half years. We have lived together for about two years in a small apartment with his best friend.

Last night we decided to have a little booze. He ended up getting pretty drunk while I was only buzzed for a little bit. We were hanging out with our roommate and decided to go to the gas station ( roommate was sober) but before we went I dabbled in some legal grass and got very high. We were outside and I believe that my boyfriends sister(15F) called him and they began talking. Me and roommate waited outside for about thirty minutes while my boyfriend was on the phone. We eventually just told him that we were ready to go and he got into the car still on the phone. I was barely able to keep my head up and when we got back to the house I just curled up on the bed feeling nauseous.

My boyfriend, still on the phone was lying on the floor still talking to her, because I wasn't doing anything, I was listening and he kept commenting about how he just loved her soo much and that it still felt like she was a baby and how she was so cute as a baby, all in this soft kind of baby voice. For context he usually talks to me in a very similar manner calling me cute everyday, all the time, and hugging me telling me he loves me. It made me really uncomfortable.

Another time about six months ago we played a drinking game with his sister at his parents house( she wasn't drinking) and we both got very drunk. He eventually went upstairs to his room and she followed trying to get him to go to sleep. I tried to follow them and crawled up the stairs and halfway down the hallway with all my might and then felt like joining them would be an intrusion so I laid on the floor listening to him talk about how much he loves his sister and how he feels bad about how he used to treat her. He was crying and sounded the most genuine he had ever sounded, it was a hard blow for me to listen to it as admittedly he used to treat me like absolute shit and hes never apologized or sounded as genuine with me as he did to her. I ended up crying on the floor and almost falling asleep feeling completely defeated.

I have never brought up how this made me feel until this morning when we woke up together. I felt mad and petty and I told him that he talks weirdly to his sister when he's drunk. I told him that while laying there listening to their conversation for about an hour I had a thought "Man does this guy wanna bang his sister?" and once I said that he got very cold and distant as he left for class. I know that what I said was completely unhinged and inappropriate in every sense, and have already apologized. I'm not sure how to approach this subject at all and I feel like a complete asshole. Any advice?