I agree with NYGal. Doesn't mean it is the end. He wanted to move anyway, so what is the difference between MD or wherever and CO. I can tell you. You are a woman who has her $hit together and OW isn't. Much easier for a little boy to follow a strong woman than to have to take care of himself and OW.
In fact I think that is what worries me is that my WW is a strong (although very mentally weak right now) so she has the power to move on and never look back.
Me 41 W 33 M 2013 Suspect A 11/15 Confirm A 1/16 She moved out 2/14/16 Stepson 13 Stepson 16