Help ptsd

I was sexually assisted as a child. My attacker was caught and imprisoned. And I went through various counseling stages and "graduated" in order to have a (normal) life.

Recently a friend has been talking to me about her daughters abuse, and it's brought back a lot of stuff. I have flashbacks and nightmares. A few nights ago I had sex with my husband. And for no reason I just started bawling. He looked so wounded and hurt and just held while I cried. He knows about my abuse, and I told him I've been having nightmares. He felt so bad the first I started crying in bed. I don't want to tell him this time. So I held back my tears and went and cried in the bathroom, he followed me a few minutes later to see if I was okay, I ran away so fast. I told him I was fine. I realize that probably wasn't the best decision lying to the man who loves me. But I don't want him to think that he caused me any pain. Any advice thank in advance.