He sounds pretty confused, but I agree with one thing - he'll never get around to missing you until you are GONE. Don't ask him not to contact you, just go silent. (If you ask him not to contact, it sounds like it's because it's SOOOO HARD for you - like you're still pining. Far better that you just stop answering, so he can wonder what you're up to and he can start missing you).
AND - yes, focus on living and enjoying life for YOU - because it IS possible that he'll never come back, if he's decided he wants to have kids now.
Regardless of the outcome - if he DOES come back, it's not gonna be for quite some time. So don't waste any of that time - go out and have fun. If you KNEW you were gonna be hit by a truck next week, would you waste all this mental space on him? No, you'd get out there and LIVE.
It's clear that this is about him, not about you, so just dust yourself off and plan some adventures. How about a trip to Italy?
