[MELTDOWN TW] My autistic boyfriend has suffered a meltdown because I did not want to perform a sexual act @3am

Sorry if the is not the right subreddit for this topic however I have no idea what to do.

As the title of this post states, my boyfriend suffered a severe meltdown which caused him to suffer severe memory loss after the event. To put in simple and accurate summary of what happened; I have been very sick the past 3 days having a flu, the night prior to this I was only able to sleep for about 3 hours and we were up all evening being at the bar drinking, my boyfriend was so drunk to the point of not being able to control his body movements. We went home for about 11:30pm and everything seemed fine to me after we watched a couple videos so I decided to go to sleep as I was exhausted. While I was sleeping my boyfriend continued to drink half a bottle of wine and I was waken up at 3am with him doing things to my below (we are both male) I said to him I do not want to do anything because I was exhausted and sick but he continued to try, I continued to say to him "please don't I am exhausted" but he didnt listen and the last time I said no he had a full meltdown where he started to cut himself and was telling me that I hate him continuously. I was reassuring him that this was not the case but he was in a meltdown so I think he did not understand what I was saying. I have taken anything away in where he could hurt himself with and then he was begging me to them back, shortly after he fell asleep and woke up about 20 minutes after and he has suffered severe memory loss and could not remember that past 3 years of his life. after a couple hours he was able to bring most of his memory back but is blaming me and treating me with so much disrespect and firmly believes I done something very bad to him. I have absolutely no clue what to do, I've never felt so hated in my life especially for not being understood that I needed rest.

This is alot to read and I apologies and I certainly do not blame him for thinking in such way I just need advice on what I can do going further, I am trying my best to continue being supportive and accomodating his needs.

Thank you