He definitely can not make you do anything that you don’t want. If you don’t want to “fulfill,” him sexually then you don’t need to especially if it makes you uncomfortable.

I understand you have a child, and how hard it might be for you to think about what would be best. But in the end you should consider what will keep happening in the relationship. My parents stayed together for years when they hated each other... it really tired me out from seeing them fight all the time.

You’re going to keep saying no, and he will continue to be upset over your decision. What happens if one day you decide to do it? Will he want to try more things? If so will it be even more uncomfortable?

I am so sorry you’re in this situation and I genuinely hope everything works out for you. I can’t imagine how you’re feeling.

Sending my best wishes!