Maybe part of him is regressing into the mommy/child thing.. but the other half resents that and wants to get away. He needs to find a working, balanced, equitable relationship with you; but instead of sitting down together and working on it, and how it would look like.. he's running away to " figure things out". (except its more like seeing "if the grass is greener on the other side").
In some ways, he hasnt worked on things between you. But in some ways he has. In some respects, he has told you EXACTLY WHAT HE WANTS in your relationship: a strong(not weak, not dependant) woman, who loves him, but still has moral standards that she wont compromise.
If you stand strong within yourself over the next two months, and DO NOT COMPROMISE (especially on sex or intimacy after he is moved out), and really show him that you can be that woman... I personally think you have a great chance at attracting your husband back to you. Hang in there, and take care of you.
My current status: june 2006. Wife ran out and filed D. Finalized Jan 11, 2010, after 12.5 years M. 3 wonderful sons caught in the middle