Huge Crush

There’s this boy who I have a huge crush on. We’ve known each other since we were 4 and we’re 16-17 now. We’re very close to each other. I really like him, and he really likes me(we’ve talked about this and he told me). However he brings me home after school everyday and one day he was acting weird. He ended up kissing me and it made my day. It really made me feel like I had a chance. But now he’s kind of ignoring me. He’s talking to a bunch of other girls who only want sex. It’s frustrating because he talks about wanting a real relationship and I’m willing to give that to him because that’s what I want. What do I do? How do I tell him I’m willing to give him a real relationship?