Lesson that you needed to learn

Not everyone is meant to stay in your life forever, sometimes they are only there long enough to teach you the lesson that you needed to learn. 
Sometimes it's the smallest decisions that can change your life forever.
“And once the storm is over, you won’t remember how you made it through, how you managed to survive. You won’t even be sure, whether the storm is really over. But one thing is certain. When you come out of the storm, you won’t be the same person who walked in. That’s what this storm’s all about.”  - Haruki Murakami