Best Friend Betrayed

Known my best friend since college and her husband since they got together sixteen years ago.
I’ve been single for four years now and they have always been supportive.
Last week he came round to fix a couple of things and for the first time ever I couldn’t stop thinking how it might feel to kiss him. I guess he picked up on my mood as he paid me a couple of compliments as we drank a cup of tea. I realised how close we were standing together and flustered I stepped back at which point he apologised if he’d upset me. You didn’t I told him and went upstairs.
Then I did a terrible thing. I took off my jeans and top so I was just in my panties. I then went back downstairs and as he looked up told him I know this is wrong but I want you to see me, see my body and I really want you to fuck me.
The sex was quick, hard and as good as I’ve ever had. It was like we just went at each other, like we were annoyed we were doing it but couldn’t stop ourselves.
Neither of us have mentioned it since but I’m not sure it isn’t going to happen again