She kept him 'in suspense' [=waiting anxiously] for two whole days before she agreed to marry him.
I don't know who won and 'the suspense is killing me'. [=I am very anxious to know who won]
The 'suspense' builds as the story progresses.
(..) but they're not. Oh, that's the good stuff. And then we get to choose who we let into our weird little worlds. You're not perfect, sport. And let me save you the suspense. This girl you met, she isn't perfect either. But the question is whether or not you're perfect for each other. (..)1997 Good Will Hunting