Sounds like you want Sally to be their as a backup option incase things go wrong with Jane. It also sounds like the one you want is Jane. Long distance relationships can work, trust me, I am in one! I've been there done that, got the t-shirt and credit card bills for flights (we live 5000 miles apart) we have been together two years and we have probably another year of living in separate counties until my visa is granted and we can get married. It is hard. Got it's hard. It actually made me ill being in a long distance relationship. But it can work. And it is so worth it. I think you are just doubting it too much. But deep down, you know she is worth it!