Well, that's interesting, Nikki, because I know there are studies on the brains of people in the throes of first infatuation that show their brain scans look like those of people on cocaine! (I think Dr. Amen mentions this in one of his books.)
So - all the more reason you need to help your H see that his life can have change and excitement WITH you.
I read somewhere once that the best dating activities for falling in love were ones that get your adrenaline flowing - like riding a rollercoaster or seeing a scary movie.
One thing my H and I did that seemed to help him - we started a "new" relationship. Called each other by different names, talked about our "former" spouses (that is, the people we were in our marriage before the crisis), pretended we were a "new" couple. Seems silly, but my H seemed to get a lot of comfort from it. Ellie