I think it would be a legitimate response. It seems like the non-cheating partner should at least be able to voice what they feel they need to rebuild trust. Other examples might be having more information about the cheating partner's whereabouts, having him/her define what working on the marriage means, asking him/ her to commit to improving communication or read a book about infidelity. Those may or may not be actual parameters - they're just things off the top of my head.