Sometimes getting to Km's their paramours helps. Not saying it will for him but its worth a try. Why not the three of you go to coffee?
Maybe he just needs time to absorb.
Send him here! Do research together, watch shows on poly, read publications.
Maybe he jat needs the education!
It's just me, my ramblings and the elevator music in my head.
Me: bi, reformed wild-child turned mom and house maid LOL
Crux: straight/hypersexual, possibly mono?
BC: our son, 5 years
CM: second son 9 months.
Mouse: girlfriend! Status new, feelings not so much.