UPDATE/PART 2

FF tonight. He comes to bed and is holding me (big spoon/little spoon). He starts trying to initiate sex by pushing his penis up against me from behind and is rubbing his hands over my butt and thighs. After a few minutes of this, he sighs and stops. I ask him why he stopped and frustrated, he says "obviously I am trying to put my hand between your legs and get you wet and you aren't showing any interest so I assumed you weren't into it" and I responded "Maybe you should have just asked". He let out an angry sigh, dropped a "fuck you" and I'd now downstairs sleeping on the couch.

I realize that I might be the AH because this was extremely petty of me and a bit childish to behave this way, but there is a level of satisfaction there and I do feel like it's deserved. I also think he is the AH for cussing at me and running away to sleep on the couch.

For context: I (34F) am engaged to a man (33M) we'll call Bobby. We have lived together for about a year and a half. Bobby has two kids (6M & 8M) from a prior relationship that are with us on the weekends and I am 8 months pregnant. Whenever Bobby and I fight I seem to take it much more personally and dwell on it while he goes on with his life with no effect. Last night we had a fight and it kept me up all night while Bobby slept. He went to work this morning and I cared for the boys while he worked. The boys had a difficult day and their behavior was very stressful for me. When Bobby got home we played a board game and then I made dinner, and cleaned up. I could sense the lack of sleep catching up to me and I was irritable and grouchy. After this, I let Bobby know that I needed a break and I was going to bed. I came upstairs and was crying just from being pregnant and overwhelmed. After I had calmed, Bobby eventually came upstairs and zi expressed to Bobby that I was feeling exhausted, and emotionally and physically overwhelmed. He held me for a few minutes then rolled over and fell asleep.

Two hours later we are woken up by an upset 8 year old exclaiming that he had gotten sick and threw up. I lay in bed a few moments waiting for Bobby to get up and care for his son. When he didn't do so, I got up and begrudgingly said "I guess I'll go figure it out, at least keep the dog up here" or something similar. I spent about 45 minutes cleaning up this child's vomit from the rug and floor and when I returned to bed Bobby was sleeping. I began to cry again as I still hadn't slept much at all, had just cared for my fiances child and began to worry about what the future with our baby would look like and how much would fall on me. This woke Bobby up and he asked what was wrong and I explained.

Bobby feels that I am unfairly guilt tripping over something I volunteered to do and never asked him to do. I feel as though it is Bobby's son and his responsibility and he shouldn't have waited for me to "volunteer" and should have just taken care of it. After some back and forth of this conversation Bobby got upset that I had woken him and was keeping him up and went and slept in another room. I am still very awake and running on less than 2 hours of sleep, overthinking the whole thing and wondering who really was the AH in this situation.

TLDR; Fiance thinks I shouldn't be upset about being the one to clean up his son's vomit after not sleeping because I volunteered to do it and never asked him.