If he volunteers information, he frees her from the constant rehashing. One time, Amanda called him. He told Gillian right away, defusing a potential source of distrust. Another time, when they were at a restaurant, he sensed that Gillian was wondering if he had been there with Amanda. He didn’t wait for her to ask—he told her, unsolicited, and made sure she was comfortable staying there. All of this, abundantly displayed, helps to restore trust, as it makes her feel that they are on the same side.