No Sex With Me

My wife and I grew up together. Went to school together. Dated for years, got married and have 3 grown children. I say we had a normal sex life. Younger years plenty of sex . As children got older sex got less frequent. Just me and my wife for years now daily life. I actually got my interest for sex and really put the charming on my wife but menopause and meds to help wouldn’t fire her up. Approximately 3 years ago after I was doing the sex charm she told me as far as she cared sex was over. She thinks we did it enough through he years. All else seems normal in our marriage as long as I don’t handle her. My wife even started sleeping in a separate bedroom. We live like a brother and sister. Not uncommon through the years we both would hang out with friends on occasions. Me hunting, fishing, build projects, ballgames with friends. We always tell who we hang out with. This seems normal. I noticed she started going out once or twice a month and get in late and she would would dodge answering her hangout the night before. Nothing better to do in our relationship I started investigating. No revealing credit card charges or other hidden evidence could I find. My wife was out one night and a friend called and during our discussion he said he saw us walking in a certain restaurant. I went to restaurant and got in without being seen and watch her have a meal with another man. These sneaking meals would happen once or twice a month. After eating they walk to her car, have a hug then she goes home. I shamefully don’t get jealous or mad. I do enjoy spying them. I deep down want them to start sex. I finally told her she was seen eating with a man and asked her who it was. She told me and said it was just a friendly meal and her friend always pays for it. I asked if it was a sex affair. She said I know sex is over for her. Many on this site are old like me, have growing old together been similar to my experience?