You say he never hurts anyone, so I assume you mean physically, because he does seem to be hurting you emotionally. If he's criticizing you, that's hurtful.

Have you told him how you feel? Perhaps he doesn't realize he's changed.

Try asking him why he's no longer interested in sex. Maybe he'd like you to do something new for him, like dressing in something sexy that you either haven't before, or haven't for a while. Maybe he has a fantasy? Ask him if that would help. (That said, don't do anything you're too uncomfortable to do. Your feelings count, too.)