Need advice

Okay. So my boyfriend is older. Like 20 years older (don’t want to hear comments on that.) And here lately, we’ve been having a lot less sex because of his depression. I am trying to be understanding and being calm, but he just keeps telling me that he just needs a little push to be turned on anymore. So I’ve tried lingerie to which he responded with “well that’s cute” and then had sex with me. But trying to figure this out is making me feel like I’m unattractive and like he doesn’t want me.

So what can I do to bring back a little spark? What can I do to make him want me again?