Cancer sounds logic to me...
Her mother had one and Lucas saying "Don't ever leave me"...well it's kind of the thing people say on a show when some heavy thing is going to happen.
Happy-go-lucky L/P never lasts...there's always something happening and the fact that they alwys find a way to face it together is what makes them so close.
As much as I love them I don't really want to see them kissing and giggling a whole season.I kinda love drama. what a masochist I am!
Seriously as long as they're in love I can handle everything!