Same story here with my husband, he actually moved out and is starting divorce proceedings, not wanting anything to do with myself and our son. Very sad. My heart goes out to you.
I have wondered what the statistics are for staying together after rehab, can't quote you any, but on this board and others, it seems to me, (just MY observation, no facts), that many marriages just don't make it. Probably not what you wanted to hear.
(Hugs)