Been with my 37 yr old bf for 2 yrs & he's AMAZING. (I'm 27) We live together & have been talking marriage/kids for 6 mo now, even picked out rings/loc/etc. He had a 3 mo assignment oversees, just got back & now he wants none of it. He still treats me like a princess & says he wants to be w me forever, but can no longer see a marriage/family, not w anyone. How can his mind change so fast? (never married b4, no kids) I suggested couples therapy & he's up for it, Im just worried that we're doomed. Could it be cold feet? Over-stimulated from just getting back to the USA? What should we do?