Move forward. Slowly is fine as long as you aren't standing still. It is essential that you allow yourself to go through the grieving process (look up the stages of grief if you feel like it - very similar to MLC stages actually). Allow yourself to cry and to be angry (but, like everyone has said, not in front of him).
When I finally was able to accept that my "old" marriage was gone and never would be again (that is not to say there is not hope for a "new" and hopefully improved marriage in the future with H or someone else), I was able to grieve and that has helped me so much to gain some ground. I still cycle between the anger at times and of course sadness, but to let myself face it and grieve has led to so much healing.
Again, not to say that there is no hope for a M by grieving its "death," but to realize that I needed to let go of it was something I needed to do.
