Most Helpful Guy
shit happens, move on with your life0
Most Helpful Girl
Maybe he got scared of commitment and went through a mid-life crisis kind of phase. However, if that's the case, the damage he is creating is pretty severe.
There's also the theory that maybe he was talking to this ex the whole time and you had no idea. If it was a random girl it may be better, because with an ex they have history :/0