I signed up with escrow. Did the process thing...but then I sent the files and domain over... I should have just sent the domain over right? =/
That depends. If you were selling your whole website, you did the right thing. If you were only selling the domain, then yeah, you made a mistake. In case you did make that mistake, try asking the guy you sold it to if he's willing to give it back to you.
I Dont think he can cancel the transcation as he has the domain .. if he wants to cancel he has to return everything u have to confirm and then only it can be done