Later…

Steve was talking to Bruce. "You are too dangerous for Natasha," Steve told Bruce. "I want you to break Natasha's heart."

Later…

Bruce, Natasha and some of the Avengers were having dinner together when Bruce suddenly got angry and stood up. "Don't lie to me," he snarled to Natasha. Natasha, almost as a reflex reaction, pulled a gun on him. Bruce left.

Later…

Steve was on an assignment when the Hulk ambushed him.