Jade doesn't believe in love. Not the way that Hollywood and "young
adult" novels portray them anyway. She thinks the idea of there being
exactly one person in the some seven billion in the world that can
make you happy and can satisfy all your needs is ridiculous. She
figures most people get married either because they are idiots or
settling, which are, when you get right down to it, are pretty much the same thing.
Jade knows her parents aren't in love. They probably never were, but
after having two kids it's not like they could just up and leave,
could they? (Apparently they could)
She thinks her grandparents might be in love, or at least convinced
themselves that they were, but then again she sees them so rarely that
they could just be faking it.
Her brother was in love once, he says, but that wasn't really her
story to tell.
So when Beck tells her that he loves her for the first time, she
punches him in the arm and walks away. He continues to say it though,
and despite her better judgment, she begins to believe him.