Hi flores2231, and welcome to Scarleteen.
We're glad you found us, although I'm sorry it's because of a stressful and traumatic experience. It can be difficult to break up with someone even when we know it's going to be the best decision; it sounds like there have been some really positive aspects of the relationship, and I can understand how hard it would be to break up with someone who's been supportive of you and who's been sweet in many ways.
At the same time, though, sexual coercion is a serious thing; even if your boyfriend ever thought you were "joking" by saying no, it was then his responsibility to follow up on that and clarify the situation, not continue pressuring you or pushing past your hesitation. It's understandable that this would be a large enough betrayal of your trust that you wouldn't feel able to continue the relationship.
How can we best support you right now? Do you want to talk about how you might want to go about breaking up, or ways you can take care of yourself in the aftermath of the breakup? We do have an article that has some good general advice for surviving a breakup: Getting Through a Breakup Without Actually Breaking