"Like the things he has said about after a d we can still live together, be friends, raise a child together"
Not sure what others think Cherry (and please don't act solely on my input) but I wonder whether it is worth setting an early boundary on statements like the above. That sounds to me as though your H is wanting a foot in two camps. A girlfriend outside the home and a semi-family (flat mates co-raising a child) to come home to - no consequences for H at all!
I presume this isn't what you want. And I think it would be fine to clarify - H, D isn't what I want. But if we do D, I wouldn't want us to live together and be friends. I would move on and hopefully meet someone else to share my life.
My H had this vision that we would just sell the house, divide the proceeds and I would melt away - leaving him to start a new family of his own. He's finding that when we put my preferences, boundaries and decisions into the mix, it isn't that straightforward at all...
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus