ha! My H mentioned the same thing to me early on, the 'we could remain good friends afterwards'. At which point I told him NO! I think he was quite surprised
He even had this nice vision of us living together while separated, in the same house, taking care of the children, having meals together, etc. I told him that is not going to happen! We are still in limbo now though, so I haven't had to deal with any of this as of yet.
M: 8 yrs T:14 Twins:7 S:5 BD:'NLILWY': Feb/2013 Mar/Apr/May: MC June: "living in limbo" Sept 12: H moves out Oct 20: reconciling Jan-Feb 2014:MC Feb 2014: separating, and H moved out.