My boyfriend slapped me

Ive Been with this guy for almost 2 years now and he's been great apart from one big thing. He wants sex a lot and I'm not saying that i don't like having sex at all either.We both work 6 days a week, sometimes im really tired.but ok, I don't mind having sex 2 times a week but he wants at least 5 times. When we started moving in together, that was one of the big issues we had to deal with.But at the end of the day I just compromised cos I understand that he needs sex to express his love and himself so i tried to work it out as much as i could cos he gets upset and grumpy when he doesn't get sex even if it's just two days or even sometimes just a day.But im alright with that as long as he treats me good. But lately, he's been really busy at work and have been grumpy so i tried to be super careful about the words i say and tried to make times to pack lunch for him and cook dinner and clean the house whenever i get off work earlier than him.Yesterday i finished work hours before him so i went grocery shopping , cooked a good meal for two of us and cleaned the entire place, he came home and after having the meal, he did the laundry and i didnt help cos i thought ive done enough for the day cleaning and cooking and also did have to work since 10 till 4pm so ya. but he seems upset so i dragged myself to help him and he goes " oh ya at last she's helping me out" in a sarcastic way, it makes me really sad so after that i went to bed since im extremely tired as well and i knew he would be upset the next day cos we didnt have sex.So this morning i tried myself to be ok and be cheerful and asks him to have sex and he goes "no no no u always wanna postpone it , nevermind " he was making me have a guilt trip.Then i burst out into tears and ask him why do i have to do it when i was sad last night. I have the right to not do it when u dont treat me good and when im sad. and i exploded and shouted at him while he kept on saying " ya ya you never want to do it anyways" i don't know why he has to be so negative about me when all i do is to make this relationship work. I really really shouted at him and he gave me a huge hard slap across my face i fall to the floor. Ive never been treated this way before,what should i do?

How long can adjust by watching what you say, treading on egg shells each day not knowing what will set him off? How long can you keep complying with him for sex even when you are not willing? For how many years can you keep doing this? Answer this question honestly and you will get your answer.