And the "I wish I could be the husband you need me to be " stuff is his guilt about this plot of his... Ya I think he is planning something and he feels bad about it...
Maybe you could confront him on the D when eh says he wants to "get on with the rest of his life" you can call him on it :
"You mean run off with OW after the divorce is filed..." And walk away... I think he needs to know you are't stupid and he does NOT have the upper hand here...
Most divorces can be stalled for quite a while if you want to do that...