“I've been making a list of the things they don't teach you at school. They don't teach you how to love somebody. They don't teach you how to be famous. They don't teach you how to be rich or how to be poor. They don't teach you how to walk away from someone you don't love any longer. They don't teach you how to know what's going on in someone else's mind. They don't teach you what to say to someone who's dying. They don't teach you anything worth knowing.”
― Neil Gaiman, The Sandman, Vol. 9: The Kindly Ones
Note: I am not a big fan of the notion "Walk away from someone you don't love anymore". If you have a committed relationship and don't love them - stay around and work on loving them. It is a terrible modern notion that people just follow their random, ever fluid, feelings. It creates a lack of stability and causes much harm to all parties involved.
