Glad you found your friend and are planning for a fun summer.
Here's an idea. Seems like H gets a lot of "space" and alone time after work....how about space for YOU. Away from kids. You're a great fall back for him to take care of the kids, but you need space too.
How about asking him to watch the kids on a given night, and go out with a friend or just by yourself. Walk the mall, catch a movie, just drive around.
Sometimes, getting up and out of the house breaks the negative rut our minds get in. It's refreshing and energizing.