He taught her how to love, but let someone else teach her how to give up on love.
And she experienced firsthand how time can wear away a person's deep devotion to another.
Only at the edge of the cliff did she finally understand: there is no such thing as being destined for each other but not meant to be. In this world, two people are either fated to be together or they aren't. They either love each other or they don't.
No matter how things end, life is short. If you love each other, be together; if you don't, let go.