The Question and Answer section for Tender is the Night is a great resource to ask questions, find answers, and discuss the novel.
Dick has a history of cheating, but specific to Rosemary is that his relationship with her is reminiscent of his early years with Nicole.
I'm not familiar with this title but check this out:
This is far too detailed a question for this short forum space. I suggest you check out the GradeSaver link below: