The first time we see Jackie, she’s at home preparing to do laundry when Peter walks in, fresh from a Renaissance fair.
Obviously, Peter should not have had access to anyone’s breast bags while he was away, but when Jackie inquires about how he ended up with this item in his laundry, he’s quick to lay on the guilt.
So, unfortunately, even though she told him off weeks ago and it seemed like she was done with him, she’s still with mooching Peter.
Peter tells her that if she’s going to accuse him of cheating he might as well go ahead and do it, and Jackie backs off, saying that she won’t mention it again.