500 Days of Summer

Tom: I don't think I'll ever understand that. I mean..it doesn't make sense.
Summer: It just happened.
Tom: Right, that's the part I don't understand. What just happened?
Summer: I just..I just woke up one day and I knew.
Tom: Knew what?
Summer: What I was never sure of with you.

That's one the most brutal lines you could ever hear someone you're in love with, say.

It would have been easier to rip out your own heart and let the person stomp on it.

The most heartbreaking line in the entire movie. Watch 500 days of Summer. It's brilliant.