Miss Manners: I don’t know what to do about my boyfriend’s habit of always canceling plans

DEAR MISS MANNERS: I don’t know what to do about my boyfriend’s habit of always canceling plans.
We have been together for a little over three years, and when he does follow through with plans, we have a great time together. The relationship is great otherwise. I have discussed this with him several times, but nothing seems to change.
There are periods of time when he won’t cancel, but then he starts doing it again. I don’t want to leave him, but I also can’t put up with his canceling.
GENTLE READER: If the pattern starts up again, Miss Manners suggests you issue a gentle ultimatum: “You seem to be too busy to see me right now. Please let me know when your schedule eases up and you won’t be compelled to change plans at the last minute. In the meantime, I will assume that you are not available.”
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(Please send your questions to Miss Manners at her website, www.missmanners.com; to her email, [email protected]; or through postal mail to Miss Manners, Andrews McMeel Syndication, 1130 Walnut St., Kansas City, MO 64106.)