Not happy with our sex life anymore?

Me and my boyfriend have been together for over two years and in the beginning he was so into pleasing me and we had sex at least two times a week. Now it’s once a week to once every two weeks and I’m starting to get agitated because I feel like I need more sex. He’s also not that much into it anymore. Does anyone have suggestions? I’ve asked him for it twice a week but it hasn’t happened.