Sexual assault

I was sexual assaulted throughout my last relationship. He would use guilt to coax me into having sex. He would become upset and angry if I said no, saying stuff like "if you really loved me, you would do this" "Are you not attracted to me?" "Is there someone else who is having sex with you?" And my personal favorite "I do so much for you. You could at least do this for me." I'm so disgusted with myself for falling for his trap every time just so he wouldn't be mad. I see sex in such a negative light, and I'm scared I won't be able to move past it. Sex is supposed to be positive, and each person is supposed to be comfortable and enjoy it. How can I move past this? Is this really sexual assault or am I over reacting?