I'm thinking of cancelling a truck trade deal after making myself seem interested
What do you mean by 'truck trade deal', exactly? I'm confused.
A truck trade is a trade where you give money to someone so they can get you a truck and you get it for free.
I understand, but it's not nice to back out of something you've already agreed to. You should always honor your agreements.
I don't have to be a good person at all.
You don't have to be a good person, but you should strive to be one. How would you feel if someone entered a deal with you and then backed out for no reason?