Love is like writing.
Freehand writing. Love goes with the flow, blinded by emotions.
Editing. Fate will find its way for flaws and correct it.
Revision. Everything will start all over again, with changes but a better relationship.
Output. Will it have a happy ending or the other way?
It's the writer's choice on how his article/story/writing will end up. It's a matter of choice of words, play with it, and making sure that readers will understand it.
It's a person's choice on how his relationship will end up. It's a matter of choice of partner, knowing their rules, and making sure that both of them will understand it.
It's not only applicable with boy-girl relationship, but also family, and friendly relationships.