Me and my husband have been trying to slowly ease our way back into sex...

My husband and I haven't had sex in a year because of him getting assaulted and raped in a club bathroom and not even remembering who did it because they smashed his head on a sink. My husband is so strong. Going through rape is hard but being a man and admitting you were raped is really hard. He's been going to therapy for it and we have been trying to have sex. First few times we started we didn't make it past foreplay and he started crying. I comforted him and let him know it was ok. This most recent time I screwed up. We actually were having sex for a few second and I ended up accidentally grazing his butt and it scared him and threw him into a flash back and I had to hold him to get him get through it. He hasn't seemed to want to try again after that and I feel really bad.