Fwiw I doubt this is permanent. My husband and I went thru something like this. A few really rough years. I went from feeling everything, to feeling nothing, to bouncing back and forth. Spent alot of time thinking he didn't understand me at all. Wanted to leave many times, found interest in others, same things you're describing even with the kids. I hate to be the one, but my personal issues were rooted in a few things: ignoring my faith, taking prescribed head meds, and prior abuse issues unresolved. I think there's hope for you but its gonna be work. If she can get off the head meds, that would be a bonus. Natural solutions. They all take time. It takes a couple yrs to get the head meds out of the system. Prior emotional issues: LOTS OF TALKING. Interest in other ppl: GET IN HER FACE. Show her who you are, what you are. Don't back down. Don't be nasty. But DON'T back down. More than likely, some guy hit on her. She's vulnerable, and it turned her head. I'm praying for you, sweetheart. This isn't over yet. Stay in her face.