It's wrong to betray your friend
Jim has been tired after working all week, but he promised his friend that he'd help him move.
Jim wants to give his friend an update.
Jim tells his friend that he's too tired but that he's willing to make it up to him later.
Jim tells his friend that he doesn't want to help him anymore.
Jim's friend is okay with Jim breaking the promise and trusts him just as much.
Jim's friend doesn't trust him anymore and begins to have trust issues.