Going through the same thing brother. My wife never went out unless we were together, never drank was never out after 10pm. All that changed when she started hanging out with this woman who in my eyes is a bad influence. They started going to this bar thats actually not far from my house and at first i didnt care but then there were signs things have definently changed because id ask her if she wanted me to come up and have a drink with her and she would say im just hanging out with the girls... its girls night. One night i went to walk to the store for ciggarettes and passed the bar and saw her and friend outside with a group of guys and she completely ignored me and i know she saw me. On the way back i said fuck it im going in there to see whats going on in there. She still ignored me as i sat down and ordered a drink and the next thing i know her friend comes over and says she wants you to leave. I looked at her friend and said if my wife wants me to leave tell her to come over here and say it to my face. She doesnt, i drink my beer and try to order another one at which point the bartender said im cut off and im asked to leave by security. My gut was telling me something was wrong and that night confirmed it. So if your gut said she was cheating then she probably was. We are basically roomates now and instead of trashing my house i trash my body with drugs and alcohol. We will get through it tho, your not alonr.