Wern't you and you bf initally going to be together with the new guy which is why you were looking?
You found him and now you're on the outside looking in. It sounds like you and your BF need a real good talk as it sounds like he changed his mind midstream.
I think that is a good idea. You can float out the idea again while he is relaxed and gage his reaction. You can then have a longer talk about it when you can both really focus.