You got jacked bro.
When it comes down to internet security if the seller does not have quick and easy communication and doesn't respond within 1 business day, 9/10 there's a major problem.
The fact you sent money without protection just seals the deal. If you ordered on Friday and didn't hear back by Monday I'm like 90% sure you got ripped off.
Every deal I've ever conducted online, be it ebay, CL, Kijiji, online stores. Theres always immediate responses, and always ALWAYS communication between me and the seller/buyer. There is no excuse for no response with online transactions. An email takes a second.
Even if he was waiting for the money to clear he would still respond to notify you of the delay.