Well, I'm 52 and I know a little bit about men, me being one.

Sounds like a midlife crisis or a little infatuation with another woman is happening. I say that because of his reaction. If it wasn't an interest (the woman) he wouldn't have held hands with her in front of you. IMO she must be pretty catty to do that in front of you, I don't care what anyone says. It's like look at me, wife, see what I'm doing and you can't stop me. I'm telling you something is going on. He could be wanting to recapture his youth, but that ship sailed long ago.

The man can't even be discreet about this so, I think you were right to say something. I wish you the best in the future, you have a big problem man on your hands.