How do i get my boyfriend to want to sex with me more.

So i’ve been dating my boyfriend for a while and we lost our virginity too each other. Everything was going well, sex was really good and last a while and i felt like we had a lot of fun. Now like a month later, He says he doesn’t really care to have sex, i mean i get it sex isn’t everything in a relationship. but now i have to ask to do it or try i suduce him when i’m in the mood. He says if i want to do it, we can do it but i felt it hasn’t been as fun or like the rush of doing it isn’t there anymore. I know he’s not cheating on me because he’s shown how loyal he is and he lets me go through his phone anytime i want. i just want know how i can get him to actually want to have sex with me again and get horny and ask me if i want to do it for once. Or to see if i’m doing anything wrong. or just something idk. help !!!!