Be an adult and tell him you are interested and would like to get to know him better, instead of fantasising about someone and hoping you'll see a glimpse of them. Afterall, he can only say no.
Well you can either wallow in your own misery for 6 weeks in the hope that you will see him afterwards and something might happen, or you can enjoy 6 weeks of your life without wasting them, and see what happens (if anything) when he gets back.
If either of you are married, or he's a member of Take That or some other boy band, then you just need to get a grip, brush it to one side and get over it.