I don't know what you said, but once words are out of our mouths, they can't be taken back. They probably believe you revealed your true colors by the bad things you said.

I don't know that you can "fix" this situation. What I suggest is you see a therapist (if need be, go to a clinic that doesn't charge too much) and talk about what happened and your anger issue. Even if you get better, this relationship might still be a goner. I can't promise anything, of course. But treatment might help you with future relationships.

Best wishes.