If the advice to everyone else here is just to give up then this site would be pointless. This site is supposed to be about saving marriages, at least that's what I thought.
IMO, the only chance you have of saving your marriage at this point IS to back off, say nothing about her dating profile and start dating yourself. It's a long shot, but I think it's your only shot. Anything else will increase her desire to get away from you.
