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Personal behaviour during a relationship and personal behaviour during a break up are two very different things. A large part of a relationship is about being selfless, but when it comes to the break-up you have to be selfish. It kinda sucks. Why can't it be the other way around?

There's no such thing as an easy break-up. There's certainly no such thing as a fun break-up. Think about it. For however many months or years you spend with the person, you are getting to know them intimately. You know how they feel about certain people, places and objects and they become your best friend.
All of a sudden you split and you've lost your best friend. Gone. The person you spent the past however long with talking about your day and how it went and who you like and who you hate at work is gone.
Sometimes your head tries to tell you that it's for the best. That a fresh start is a positive thing. And it is. But the heart doesn't always want to listen. And that's what sucks.