She had liked him for three years, from the first glimpse in the cafeteria to the moonlight at the top of the stairs. He finally responded, but on the way to school, he left the words "I like you" in the wind forever.
He remembered everyone except her.
Then he remembered. Then she had someone else. Later, they clinked glasses at a class reunion and said "Long time no see" to each other.
It turns out that the best ending is not to be together, but to be happy separately.
Purpose: Some people spend their entire youth teaching you what love is, and then leave, allowing you to love others with this understanding.