This sounds all too familiar. My 41 year old husband informed me on our 21st anniversary that he might have to leave if "things" didn't get better. I didn't know anything needed fixing. We have 2 beautiful kids, 8 (girl) and 10 (boy), a wonderful house on a farm and have enjoyed "the good life" for many years. He said he just wasn't happy. Then he started blaming me for everything that was making him unhappy. He became a Dr. Jekyl/Mr. Hyde. It became a bunch of nonsense. After many months of thinking he was going through a midlife crisis and he would just snap out of it eventually, he wanted to move into an apartment so he could have his space and think. Things just became "bizarre" and knowing something was up, I hired a private investigator as a last resort. Ends up he had been having and still is having a long term affair with one of our friends. I still believe all of this is part of a severe midlife crisis and one day he will hit the wall and realize what he has done. I'm afraid too much damage has been done to save our 25 year old relationship and I'm sad about that. I just feel really sorry for him. My advice to you - think the unthinkable - another woman. I denied it for so long and still have a hard time believing everything that has happened over the past year. It's so surreal. I couldn't and still can't imagine that my husband would be capable of such deceit and dishonesty and I still have a hard time believing that he could loose sense of all the values and morals that he once had. I don't think that in your husband's case - it's just "out of the blue". Investigate and take care of yourself.