The person who changed may have to live with memories that changed behavior cannot delete.

Change works forwards only. Someone can become genuinely different, reliably and over years, and the people who were there before still hold what happened, because a memory is not undone by later evidence. That is not unfairness or a failure of forgiveness; it is simply how the past is stored. The hardest part of changing is usually accepting that the improvement does not come with an eraser.

If this is your situation, keep going without demanding that anyone update on your schedule. Let the new behaviour accumulate quietly, and treat other people’s caution as information rather than as a verdict.