Final answer:
Marji's response to the break-up is complex and not directly depicted; however, she is shown as emotionally detached and self-involved when dealing with Bernice's distress.
Step-by-step explanation:
Marji's reaction to the break-up is not explicitly stated in the provided reference texts. However, the texts suggest that Marjorie (presumably Marji) is depicted as cold, indifferent, and at times cruel in her interactions with Bernice. For instance, Marjorie coldly offers her month's allowance for Bernice to stay somewhere else after she experiences emotional distress.
The reaction to the concept of a break-up can be inferred from an image described in the question, which depicts a cartoon-like figure looking at a phone with a reaction of disgust and disbelief. The figure is a clear mix of emotions showing disgust, disbelief, and sadness, which might mirror Marjorie's complex feelings about the situation with Bernice, if indeed 'Marji' refers to Marjorie.