If your H is having a MLC he is most likely depressed. Did you notice him being depressed or acting differently before ow or BD? Depression permeates all stages of MLC. However, you may see a temporary lifting of it in the beginning of the R with ow. That is due to the 'love' hormones circulating in their brain.
When the MLCer realizes their problems follow them no matter how fast they run or who they're with, the depression is still there.
Until and unless he faces the issues within and deals with them, he will remain in the tunnel.
GWN, I took a break while writing a reply to your above post. I went back to read up on your sitch. I have a question. From how you describe your H when you met, I was wondering if he was in the beginnings of MLC then? Just some of his actions during your courtship and M seem suspect. I know that it doesn't really matter. Just understanding helps me cope and I know there are others like me.