Why is it so painful to forget someone? Time will make you forget. If time can't make you forget people you shouldn't remember, what's the point of our lost years?
Knowing that you will lose your freedom, knowing that this is a life-long contract, you are willing to make a promise in order to get each other and make them happy. Love is a process of pursuing unfriendly. When you complain about being unfriendly, it is when you don't love him.
Like a person, there is no pain. It may be a long pain to love someone, but the happiness he gives me is also the greatest happiness in the world.