How does Rose change in her section? What is the catalyst?

In Chapter Seven, we learn that once they were married, Rose let Ted make all their decisions. Then, after he lost a malpractice suit, he started pushing Rose to make all their decisions. One day before Ted left on a business trip, he picked a fight with Rose to try to show her how they had grown apart. Then he called from his trip and asked for a divorce. It made Rose wonder how she could be strong when she could trust no one.