Maybe you both are...

Routine, while great for encouraging trust and intimacy, often takes away the excitement and the novelty of things. By definition if you're feeling very secure, you can't feel the rush of insecurity, or enjoy the thrill of the chase. You've got him, you don't have to win each other over any more.

You might want to introduce some new things to your life style, make each other less available, so you can still cherish the time you have together. I don't mean sexually, though that could be nice to. Start taking evening classes. Have something new to deal with, and tell him to do the same.