It's his responsibility to bring it up, because if he thinks about it, he can relieve Heather from the obsession, and from having to make sure that the affair isn't forgotten, and that in itself begins to restore trust.
Par to runāt ir viņa atbildība, jo, tam pievēršoties, viņš var atbrīvot Heteru no uzmācīgām domām un vajadzības pārliecināties, ka dēka nav aizmirsta, un tas pats no sevis sāk atjaunot uzticību.