The wolf does not need permission from the sheep to remember what it is.

People show you what they are through behavior, and no amount of your understanding, hope, or good treatment alters it. Waiting for someone to become different because you have been patient is a common and expensive mistake, particularly with those who have shown you clearly and repeatedly.

Believe the pattern over the promise. Ask what someone has done over the last year rather than what they have said. Adjust your expectations to the record, and stop being surprised by consistency.