Low sex drive? I need love advice

I’ve been with my bf for about 2 years now... at the beginning of the relationship I felt like he was the one who was initiating ‘fun time’. He would lay behind me and rub my ass and start kissing my neck and one thing would lead to another and he’d start rubbing me and it was great 💥. But now it seems like I’m always the one who is initiating things and when I do it doesn’t seem like he is ever into it. He only gets into it cuz he know that’s what I want (which is fine) but I want him to do it because HE wants to, not because I’m forcing him to. I’ve tried sending pics of me in my bra and undies to get him stimulated and he said I look great but he’s not into those kind of pix. I want to sext him but idk how to start, or what to say, or if he would even respond... we haven’t had sex yet but I’m on BC so I’m ready for it to happen... idk if he wants to or not.....