Don asks Sylvia to remove her cross. She tells him she won’t, and he turns it around so he can’t see it. She tells him she prays for him to find peace. What she doesn’t yet realize (or maybe she does; Sylvia is an interesting character, beautifully played by Cardellini) is that Don Draper will never find peace.
All the main characters are tangled in complex collaborations, whether willingly or unwillingly, sexual or chaste. Everyone’s wrestling with guilt in this episode, handling and mishandling situations as a result. Don Draper is, as ever, standing at the center of the tempest, acting as though he’s a port in a storm when really he’s rocking harder than anyone else.