Sure you are bummed.
Your neighbor, the contractor, made a promise that you cannot and should not keep. This is his mistake. He is trying to pressure you into doing something that you know is wrong. Happens all the time. If you do this and something goes wrong it is on you.
The only time that I would step over a contractor, without his permission, and go to the homeowner would be to collect my money. If you really want to try and salvage your relationship stay away from his client.
Your neighbor, the contractor, made a promise that you cannot and should not keep. This is his mistake. He is trying to pressure you into doing something that you know is wrong. Happens all the time. If you do this and something goes wrong it is on you.
The only time that I would step over a contractor, without his permission, and go to the homeowner would be to collect my money. If you really want to try and salvage your relationship stay away from his client.