I've been sleeping on the couch the last few nights also. It is so hard to be detached when he's in the same space. Make sure there is space between you and him. It sounds like he is not grasping how serious you are this time. My husband was overly nice until I stopped the divorce. It is better but not the marriage I envisioned since he is not in recovery and really doesn't see a problem. H does not have a problem I do.
I am working more hours. Saving as much money as possible. Keeping myself busy with our children and my life. Planning for our future without him. Not including him unless I outright have to. If I give in I'll just have more of the same.