[WildFlower]

I have a situation I need advice on. If I had it to do over again I would do differently. We have been seeing another couple for nine months now and we are friendly comfortable with each other. Drop by and visit each other frequently. My spouse and the couple work day shift I work second. Well the male half of the couple stopped by the other morging to see how I was doing because he was out running errands and his hours are flexible. I had been down in the dumps a little and he stopped by to say hi and make sure I was doing good. Well I was still half asleep and he mentioned he would like to cuddle and I said sure. We do this sort of behavior when we are all together. Well he kissed me and started rubbing on me and we got carried away and had sex.
My husband has let me have sex before when he was not there but I always asked him beforehand for permission. I did not plan on this happening. I was going to tell him that it did happen but the male half wants me to keep it secret because he doesn't want his wife to be upset or my husband. I think my husband would be upset but I think he might understand. The male apologized for his behavior and I apologized for mine. Nothing like this will happen again.
I want to tell my husband but am afraid he will be upset. Is it better to telll him or let it go and make sure never to put myself in such a situation again????????