I have a long time female friend, we are just friends and have always been. Her husband goes to the same gym i do and i don't really know him only to say hi and such. Well i saw him and another woman hugging and kissing in the parking lot the other night when i was leaving. That really bothered me and i think i should let his wife know? I don't know what to do. I think i would want to know if that was going on. Advice please