Enjoy the time she has, that's more ominous than she'd like. "I'm going to lose you again, aren't I?" It's always been a constant fear, that one ay when Tony goes out to be a hero he won't come back. She knows that one day, it'll happen. At the same time, she knows she can't try to stop him; not really. This is something Tony has to do, it's something that's at the core of who he is, and she loves him for it as much as she loves everything else about him (mostly everything else.)