Jen - Big clues here, I think. He needs to see you NOT DEPRESSED!
I know, it seems ridiculous to expect the LBS not to be depressed. Yet the WAS (who usually is suffering from depression themselves) cannot bear to come home to a sad LBS. They're MUCH more likely to be attracted to the LBS who is happy, upbeat, and having a heck of a good time in life. Especially if they start to worry that some new man will take their place.
So - this is a time to "fake it 'til you make it". Be cheery and happy when he sees you. Put on some upbeat music around the house when you know he's coming over. (Heck, I used to "stage" the house like a fancy store - lighting, music, smells - and would be dancing in the kitchen making dinner when my H came home at night. Tom Petty's Greatest Hits was my theme music.)
Do some 180s. Take up some new interests - ones that would surprise your H. Get busy going out with friends - make new ones if you need to.
Ask yourself, which is better - for H to see you as a apthetic depressed woman who will always carry a torch for him, or as a vibrant, surprising, fascinating NEW woman that he would like to get to know better????
You can do this. He's given you all the clues. Make a game plan.