I read a book call "endless pain with love"

IN a book of no ending had written in a red ink about love that love is not about just to be happy and last long or forever with the one u love,but it about how much and u take the pain and move forward together with her, if u can do that, then that is what call love that u are showing; , i agree with the book but not sure about u all, cause i saw some relationship that only want to be happy , then once they face the problem , then sure break up as a solution,