I feel for you as I am pretty much in a similar boat. My wife had developed this online friendship with the gym instructor where I used to go as well. I found out after she left me. She left the gym and apparently made no contact with him till November while she was working to get her feelings back for me. She did say that she was thinking if moving back etc - but all along I was her safety blanket. Anyway, I think her game with me is over- and I fear the same for you. Just be the best you can for your kids. Apparently this newness feels like a drug like cocaine for women and makes them oblivious to any pain they cause their family. Hopefully she will realize the bond is stronger than these fleeting feelings and make her way back to you. In the meantime expect coldness, childish behaviour and selfishness.