TTPD Guilty as Sin. People are suggestion she had an emotional affair with Matty while still with Joe but I don’t think that’s what guilty is talking to in this. As someone who’s been guilty as sin, the feeling comes from KNOWING they’re wrong and bad and ur gonna be judged. I think she feels guilty for choosing someone who’s so toxic. I’ve had those same feelings. The guilt and shame comes from knowing it’s wrong because of the person.