[niente_]

Well in my opinion he doesn't have any feelings for you. By saying he might date another girl for a rebound, he's saying he's putting you on a back bench. As in, lining up girls he feels like he'll go out with just for the sake of it. You don't want that type of guy.

You need to get over him. Because if you don't he will use you. How can he still have feelings for you if he's dated another girl for nine months? And then he is willing to date a different girl just for the sake of a rebound? He knows your have feelings for him and he is willing to use you. Do you really want a guy who does that? If he really loved you, he'd tell you, and he'd date you, and for a better reason than using you as a rebound. You even said it yourself "USING another girl". And he's already told you nothing will happen. He's getting your hopes up. Actually, he's ALREADY got your hopes up by telling you he'll talk about "us." Look what it did to you. What's gonna happen if he says no? You'll be gutted. And that's what will keep happening if you stay best friends.

Like I said before, you need to get over him. And I swear, the only way to do that is to stay away from him. I've been through it, and I know that this is the best way. I was friends with one of my ex's for months, and the more I talked to him the more I gave him an opportunity to get my hopes up, only to crush them and hurt me. I'd hate for you to experience the same. You may not want to get over him, or stop seeing him, but this is the best way. I swear by it.

Don't talk to him. Don't see him. If he asks why, say you're busy. No calling him. No going on any social network profiles that he has. Hide anything that reminds you of him. It'll hurt at first, but it works. It'll be the best thing for you. If you don't do it, you'll feel horrible for a long time. Please, for your own sake, get away from him and get over him. He's not interested in you, you'll get used and get hurt if not.