Getting screwed over on a payment for a parts purchase?

Also was the first one friends and family and was the second one suggested to use friends and family to save money?..
The first time was an ebay purchase, and that comes right out of my account.
I felt comfortable with the seller, so i felt friends or family wouldn't be an issue, for a second private purchase, off ebay.
Guess that's now turning out to be my error.