Getting the spark back?

I'm in a weird rut. My husband and I have always had a great sex life, but once we had two kids It seemed to have dissipated. He's still way into me, and I'm obviously still attracted to him. But idk when I lost all confidence in myself. I'm 29, active and have no reason to feel this way, I have no body complex.

I keep thinking I want to buy some nice lingerie and suprise him, but I feel embarrassed actually doing it? WHY? I never use to be this way.

It's starting to create tension, as if I dont want him, and I hate that I'm making him feel this way.

Advice? Stories? HALP!