When they first met, neither of them understood love.
So one hurts the other wantonly, not knowing that the other will be the love of his life, and the other is willing to be hurt, thinking that is love. When a lot of hurt piled up and people changed, he finally remembered what he had read in a book many years ago:
"If you plan to love someone, you have to think clearly whether you are willing to give up your God-like free mind for him. From then on, your mind will be bound."
So if they are both willing to build a strong bond for each other, is there still a chance to fall in love?