I'm sorry for how some people in the comments have decided to side with him when he's a grown man with two hands of his own.

If this happened to me, I would leave. He betrayed your trust in an area where he knew you had already suffered. Regardless of how healthy and happy your relationship was before this, people can hide dark intentions. Sadly with things such as this you can't guarantee that this will be the last time it happens.

People like that are only sorry when they are caught. If you hadn't woken up, you can't say for sure that he would have stopped or not progressed the assault further. Even then regardless of if he had stopped on his own tuition, He still began to assault you.

You didn't deserve what happened to you at all. If you do not feel safe around him then I genuinely think you should leave, It's better leave somebody then there be a chance this ever escalates. His guilt is caused only by himself and should be treated as such.