"I love you but I'm not in love with you." It is called ILYBINILWY. After 20 years, it is more of a routine, it's not the passionate. I have some similarities to yours.
I think it really was a recent affair. I think you would have seen it earlier if it had been going on much earlier, I would doubt not more than six months, I would guess about three months. The shaving, the lingerie, the phone not responding - this is when the affair probably was a month or two after it began. It probably started out in work, in closets, in cars, and other man and your wife realize they would get caught, and that's when the 200-plus mile hotels began, probably a month or so after the affair had begun. Also, some is affecting your wife's empty nest, menopause on it's here or on it's way soon, the new job, the other man is competent and respected, and he played a big game for her, it was flattery.
Empty Nest Syndrome refers to feelings of depression, sadness, and/or grief experienced by parents and caregivers after children come of age and leave their childhood homes. This may occur when children go to college or get married. Women are more likely than men to be affected; often, when the nest is emptying, mothers are going through other significant life events as well, such as menopause or caring for elderly parents.
Your wife still was loving to you, still being sweet to you, etc., but this would not have lasted that much longer. The longer the affair would last, the longer your wife would get more and more emotional to the other man, and eventually your wife would be full-out "in love" and ready to divorce you for the other man. I don't think your wife was that close to it yet, but I really do believe it would have happened on about another few months to six months down the road.
That's what I think based on what you've posted, and not unlike than some similarities of my own, as well as other people in real life I've known.
Finally, I think you are NOT completely on the same page with your wife. Your wife still is routinely keeping your sweetness to you, but inside her head she has started to feel things have not been great, not like you thought it was. She was feeling that something was wrong, that this new other man was awaking something in her, and that is just not something she could have told you the truth to you. It is not your fault, how could you know all of this stuff was going on in your wife's head if she didn't say it to you.
Your wife's affair had to "deserve" for a reason; I don't think it was anything about you, I would guess that your wife is feeling down about the empty nest and those other things made her feel that she "deserves" that. Also, I would suspect that other man has "connected" to your wife on that, he probably saw how your wife was a little depressed or down for a day and other man was observant and insightful enough, or just lucky, to "connect that feeling" with your wife, and then other man probably helped pushed away the fault plane and fracture between your wife and you.
[This message edited by wk55hn at 9:19 PM, January 30th (Friday)]