Boyfriend problems

So my bf knows that I was sexually abused/harassed and he knows that I still have difficulty dealing with it and moving forward. I told him how I feel unclean and used whenever I think about it, and today when him and I were making out, he made a comment about me kinda being a slut so I asked him bluntly if he actually thinks that about me and he said yes. He then went on to explain why and I couldn't help but feel slut shamed and kinda attacked. I know I shouldn't have but afterwards I started crying and feeling ugly and ashamed of myself. I don't want to tell him it hurt me because I know he'll feel bad but I don't want him to think that was ok either... what should I do??