Originally Posted by penny1fan
i never kept paul's money he was refunded as soon as i got back online,I never stole from nobody as a few members suggested..that is silly some of you may see it that way but i do not.
It's contract law. Once you agreed to the deal, you owed him delivery of the goods. When you failed to deliver (returned the money and told him no deal), you breached the contract. You owe him damages in (likely) the amount of the difference between what he paid and what you received from the second buyer.
It's like stealing because you owed him the cards. They should be his property. You chose to keep his property, as well as the profit from the sale of his property.