Faded

"Our memories are faded but not gone."

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It was when they were 5, they met and it was the start of their friendship.
It was when they were 10, he had fallen for her.
It was when they were 15, he finally realized his feelings for her.
It was when they were 17, he finally confessed to her and it was the start of a new relationship
It was when they were 20, when she left him and it was the end of their relationships.