Remember who you were before you met him, remember what you used to do before you met him.
Because you were that awesome person you were able to have great time when you met this guy.
If you both really had great time, lets hope that he will definitely come back for you.
You guys are compatible and that is why you had great time when you were together.
Keep your calm and be your own person.
In fact you probably don’t know this guy completely yet because you are so mesmerized by great times you had with him.
As you said there is a definite possibility of something happening in future – Whenever he gets in touch with you, don’t show your desperation – focus on knowing him better for your own sake – know his real interests, understand his positives and reflect on his negatives/weaknesses and check with yourself whether you will be able to live with him if you guys were to be together for real in future. Also, allow him to know you and understand you genuinely. That means be a genuine person and don’t be a desperate one seeking attention from him.

Your curiosity to check on him (facebook) etc will develop and unnecessary tension within you and when
you meet this guy again you won’t be able to be yourself. That might turn him off and you might miss out on
something real that would probably have happened had given him a fair chance – by simply being a good
friend, a good companion. Checking facebook, and other sorts of sneaking won’t help you get anywhere. It will
eventually become a habit that you won’t be able to get rid of and as a result you character will be changed
from someone who is happy to someone who is always in-secured.

Whenever your mind seems to be unnecessarily thinking of him – Flip that thought to some activity you can do.
Whenever you want to check him on facebook – Curb the urge by opening tinybuddha and read forums to understand what people are
going through. In fact I would suggest to stop checking facebook updates for a month or so till you get to a point of being yourself.
It worked for me!

Be happy 🙂 and live in the moment – watch movies, call your best friends, cook something, go for a run, read a good book
that you’ve always been longing to, volunteer, focus on your work, career, help other people who have problems here in this website,
do your pending chores…there is soooo much to do in this world! 🙂
There is no time to live in imaginary, could-be, would-be, could have been, will-it-be world.
Give him his space and enjoy your time and space alone this end as well.