Thank you! You've really helped with reframing my perspective.

We have the kind of relationship where it feels like we could easily pick up where we left off before the marriage went south, and that's why it feels like a natural step at this point...

I'm wondering if/how to clarify my expectations to him if this is his end goal.

Me - 30, H - 32
T - 10, M - 6, D - 1
DD#1 - 4, DD#2 - 2
on/off OW 4/09 - sometime Summer 2010 (Told me about OW 4/10)
Separated 6/11/09, divorced 8/4/10, trying again 9/2011