Am I justified in my frustration?

Can I take this in a different direction.
Let's say you bought a car from a member here.
Killer deal. Car arrives as advertised. Running car.

You sell off most of the parts.
Then let it sit outside for a few years.
Original owner asks to buy it back.
Car is in poor condition. Water damage, cracked heads no antifreeze, did I mention it sat outside.
Original owner still takes it back for more then he sold it for.
Now I'm not saying it was a smart move.
But would you have sold it back for more after you sold off the interior and some high priced NOS parts.
And considered that a profit.
Or get as much as you can, considering you call the original owner a friend.
Just asking
Did the “you” tell the buyer all that was gone and the current conditions or did the “you” cover it up?