Operator gave it to you straight. If you break a chain, it's usually either because the closure pin was closed badly leaving a link vulnerable to the side stress of shifting. Also if you shift under load the side stress is enough to overcome the peen on the rivets, allowing plates to move out to where they eventually fall off on one side, after which the chain will break the next time it's loaded.

Once you break a chain, simply repairing it without verifying the cause just sets up the next failure. At this point, given that it has 2,000 miles on it, I suggest you start fresh rather than risk a third break.