As I said earlier, I think you stated your boundaries clearly and he should know very well what it is you need from him to consider a R with him.
Having said that, I wouldn't hold my breath waiting for a response. I think JD may be right when he said that he probably doesn't know what to do right now. His letter was probably an attempt to keep you on the line because he feels you are drifting away. That's good in the sense that he's still interested in you, but all signs point to him not being ready to give up the other W, even though he's implying that.
It seems like he still has some big decisions to make. Stay the course, you're getting his attention!
