I'm afraid you got scammed dude!!! Why haven't you used any escrow, both of you are not trusted enough to trust one of you or both.
I understand that the amount is low but nobody wants to get scammed even for $10.
If you got scammed fill the form in the sticky thread in the Scam Accusation board here: https://bitcointalk.org/index.php?board=83.0
Never sell something here on forum without using a escrow (unless you receive the payment before).
I see the OP was online (last time) on July 08, 2017, 07:54:27 PM
Maybe he is just... busy. If he does not reply in 7 days then you should be sure that it was a cheap scam...