What kind of reality is predestined relationship?

Life is so deep, many things are really meant to be, and no one can change it. Many people have never understood why love can't be together, but will meet. In fact, all this is just an experience! We became attached 500 years ago, and our previous life was destined to be different from today. Meeting is an unfinished life before the knot. If life is over, fate is over. Some love is too shallow, everything has a destiny and can't be forced. ?