Of course it hurts when you find out it was all a lie and I was just a single piece of his "puzzle" and nothing more. I'm not crazy or "psycho" it's the same term used for all of us when we figure out the truth.
If your child is old enough to judge, they are also old enough to learn the truth about their judgements.
Don't kill yourself over a boy, he'll bring another girl to your funeral. - this may be the MOST inspirational & truest advice I've ever seen for young girls who think it's the end of the world when a boy dumps her-