Hi Pink (former Toots here - decided to change my name.)
Gosh!! It certainly sounds as though the reality of D is biting for your H. He clearly has regrets, but I think you may be a little like an ocean liner here....slow to turn.
TBH - you have (both!) been through so much here, I think the dust probably needs to settle. The ink on the D agreement is barely dry!!
I would buy yourself some space and time and if you are at all interested in possible R, see what unfolds? Starsky once said that a good way to approach things may be to date for a few months without making any kind of decision - just to see how you feel in each others company.
However, a note of caution on the OW sitch. I'm sure someone also posted that unless WAS has been free of OP for at least six months, and firmly committed to R, it's not a good idea to 'go there.' And I think there are some conflicting messages about OW from MIL, H etc.
I would keep moving forward and making your own plans for now my lovely. You may also want to set some boundaries with H on massive R talks if they are difficult for you.
Sotto xxx ps: my H just filed for D this week...
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