I told him no, he did it in my sleep and I don’t know how to feel

It’s not uncommon for us to drink/smoke a lot on our days off. I’ve also been taking some allergy meds and drowsiness is a side effect (not sure if this is relevant but I’ve been going to bed earlier since starting them). Around midnight, I started drifting off. Bf tries to convince me to stay up, but I tell him no, I’m really tired and have to work in the morning. He tries a little more and tries to seduce me. I’m firm in saying no. He says he’s going to masturbate, I say okay. He asks if it’s okay if he touches me (boobs/butt) if I’m asleep. I say yes. He asks if it’s okay if finishes on my butt, i laugh and say sure. He asks about finishing on my boobs instead, i say no. He asks about penetration. I say no. He says okay. Very clear, explicit boundaries of what is/is not okay.

Because of my allergies, I had a hard time breathing and was in and out of sleep last night. One of the times, I swear I FELT HIM in me. I woke up this morning and he asked me if I remembered the night before. I was convinced that feeling him in me was just a weird dream so I said no really. He tells me about how drunk and sleepy I was, that I was talking in my sleep, and that I woke up a couple times asking for water/tissues, but he didn’t mention sex. So I assumed it WAS a dream. Until 2 minutes later when I’m in the bathroom and semen runs down my leg. My stomach dropped. He definitely penetrated me and finished IN me while I was asleep. My bf has never been aggressive, or scummy, or a liar, so I spent like 10 minutes trying to figure out where the miscommunication was. Did I say something in my sleep that made him think I was consenting?? And why didn’t he mention it??

I decide to test it, if I had consented in my sleep, I’ll question him about it and he’ll tell me so. When I got out the shower, I asked if he finished on my butt (what we agreed to). He seemed caught off guard and I’m like “yeah you said you were gonna masturbate and finish on my butt cheeks. There was cum on my thigh, I thought you would’ve wiped it off”. I guess it clicks for him and he says he did, and recounts how tired I was and that I DIDNT want sex, so he masturbated, finished on my butt, and wiped my butt off but must’ve missed a spot. I say okay and leave it at that.

I haven’t confronted him about lying because I don’t know what to say or what to do.