Pegasus has good advice and Bill made some good points.

Long distance is hard, yes, but it can work if two people really want it to work. Can you talk to Jane about your concerns and find out where she stands on waiting for you to be able to live in the same country? Perhaps that will help you to feel better if you can voice some of your concerns to her? She's waited five years already, so one more year should not matter so much, especially if you can visit back and forth in the meantime.

Also, it wasn't working with Sally..... you say it was a farce by the time you visited Jane. Seems you are really in love with Jane, not Sally. If you were truly in love with Sally, you would not have met Jane in person I am guessing?

The question I would ask is how would you feel if you let go of Jane at this point to pursue a relationship with Sally? Would you regret it? Would you always wonder about Jane and still want to be with her? Therein may lie your answer....