"If your going away now and coming back later means that you don't leave later and never come back, I can live with it." Dick tried to imagine what it would be like from her perspective, not only to find out what it would be like to be married, but to find out that you were the one to instigate something you thought to be among the most terrifying things on Earth.
And then feel pressed to leave the person you married, however briefly.
Nightwing put his gloves back on and replaced his mask. "I believe you'll be back. And I'm going to go sort out my problems my own way." He walked to the window and gave a genuine, if brief, smile. "See you later, Little Wing."