Confused

I guess I'm just confused. I don't really understand what my friend is thinking. I'm doing everything that he told me to do, I'm asking how he is and trying to talk to him about things but I never get a response. And he keeps saying that he wants a relationship but he doesn't like his other friend being in a relationship. I guess I'm just a girl and what I say doesn't matter. I've tried helping and now we can even make conversation in the car. I feel really disconnected from him. I would never in a million years lose him as my friend. He's been there through the thick and thin. He's like the older brother I don't have. He knows all my secrets, everything. Even if he doesn't look like he's listening I know he cares. And it breaks my heart knowing that I'm ultimately doing something wrong. I guess I don't understand. Maybe...I dunno I just don't know. I'm not going to have the answers all the time. I just want to know he is okay. There's too much that has happened for me not to worry about him. Maybe I need to let go and stop worrying. But how can I when he is family to me?