I think that, when you're back, and if you want to have a relationship,
the best thing to do would be to not contact him directly, but make sure he knows you're back,
and show confidence and that you don't really need him.
Maybe then he'll switch gears and pursue you, but I don't think that it'll help
if you start pursuing him!
But I don't really know.
If he's not interested, either way won't make a difference I think, but I understand that you'd want closure.