No Sex, Heartbroken...

My husband never wants to have sex with me. He says it's because his brain doesn't stop, so he can't get in the mood, but I know he struggles with homosexuality, too. But I can try to be suggestive or sexy, and he just tells me I'm pretty and gives me a peck to placate me, then changes the subject. This is not the sex life I want. It's not the sex life he led me to believe he wanted, either. I don't know what to do!