Confused sex life.

My husband and I had an amazing sex life when we first started dating around 3 years ago. Now we maybe have sex maybe once a week and he acts like it’s almost a chore to the point where I feel bad for asking for it. When I’ve talked to him about it he just says he’s not a sexually driven person and he feels too tired for it. So as hard as it is I’ve accepted it. Well today we were in the car driving the two hour drive home from visiting the ocean and the conversation turned to sex. We were talking about when we were younger and he told me about how this ex of his used to video-chat him while she was masturbating (that doesn’t bother me, I wasn’t around then) what bothered me is that when I asked if he masturbated to her and he said “yeah! It was super hot!” And I said that’s strange since you’re not a sexually motivated person and he said “yeah but if any guy sees a naked girl with her legs open masturbating, he’s gonna get turned on!” The thing that bothers me is when I do that he couldn’t care less! I can parade around in my sexy lingerie, masturbate for him, sleep naked, doesn’t matter! I’m not getting any. So is it a problem with me? Is he just not attracted to me? Idk what to think. I feel so unattractive right now. Any advice helps please, I’m feeling down about myself and my relationship right now.

PS. If anyone has tips on how to amp up our sex life, I’d appreciate it