It's a long story - as I say, it went on for 8 years. However, I will try to summarise. One of the issues that led to the difficult spell was that my wife, who had been a SAHM, suddenly wanted to assert her independence. This took the form of going out most nights during the week; to the gym, to play badminton, to sing in a choir, to join a dance group, to do aerobics. If anybody suggested doing anything new, she was up for it. Nothing wrong with that, but then her Friday night at the gym extended into a sauna afterwards and she wouldn't come home until 10:30-ish. Nothing wrong with that either, but then she got to know a group of guys in the sauna and after the sauna they would go to the pub. One of them in particular would drop her off at about 11:45. The first night it happened was a cold, foggy winter night and I was starting to wonder where she was. When I protested (a) at how late she had come home and (b) that she had not warned me that she was going to be late, the response I got was similar to the things that women on here say: "controlling" for example. The Friday night thing became a regular fixture and I had to get used to being disturbed by her coming home late every week.
She developed a fairly close friendship with these three guys, to the extent that they persuaded her to do the 3 peaks challenge twice. The first time I wasn't too happy about being left alone to run the ship and the boys being left for part of the time when neither of us was at home. However, that cut no ice with her; she was doing what she wanted to do and essentially I could like it or lump it. By the second time, we had started to grow apart and I knew that there was no point in protesting. I had also started to get used to running the home without her there. Of the three guys, there was one in particular I was not sure about. I met the other two and they seemed harmless, but this guy always avoided me. I shall never know whether there was anything between him and my wife, but there were plenty of signs that something was going on.
I have a female boss who is also a very good friend. I confided in her that I thought my marriage was heading for the rocks and she suggested that I should also develop an independent life and also stay out until 11:45 on a Friday. I found that very difficult to take on board as I had always centred my life around home and family and didn't want to stay out late. Anyway, since nothing else would persuade my wife to take more interest in our relationship, I took my boss's advice. I made sure I came home later than my wife every Friday night. I commute to London, so it wasn't difficult to find somewhere to go after work and a group of colleagues to go with. If I left at 10:30, it would be midnight before I got home. I can't say that I enjoyed coming home late, but it was worth the experiment to see if it would make a difference.
After about a year of this, my wife decided she didn't want to do the three peaks challenge again, but the guys were pressuring her. The sauna at the gym started breaking down and her little drinking group fell apart as they went to different gyms for their Friday night exercise. It was convenient for her as she was able to avoid them and the pressure to do the 3 peaks challenge for a third time. Meanwhile, I was still coming home late on Fridays and the relationship was bumping along.
Eventually she said to me one day - quite out of the blue - that she was expecting me to announce at any time that I was leaving her and the boys. I assured her that I had no such intention and asked what made her think that. She said it was because I had become so distant. After that and a good long talk, the relationship righted itself and we have never looked back. We never talk about that 8 year spell, other than oblique references to "that time", and right now we have never been happier.
As I said, that is only a summary. I could write a book about other things that happened. One of the aspects that concerns me now is that since discovering mumsnet a couple of years ago, what I have read on here is familiar and I do feel more to blame for what went wrong than I did at the time.