Feeling guilty after setting a boundary doesn’t mean you did something wrong. It means you’re new at it.

Guilt is not a reliable judge of whether something was right. It reports on what is unfamiliar, so the first few times you say no to someone you usually say yes to, the alarm goes off no matter how reasonable you were. That feeling is about novelty rather than morality.

Expect it, and let it pass without treating it as a ruling. Do not apologise twice, do not send the long follow-up, do not quietly undo it an hour later. By the fourth or fifth time the alarm gets quieter and the limit starts to feel normal.