There's no point of giving your heart to someone when that someone's heart is somewhere else.
Failed relationships can be painful or distressing, but it is important to remember that a failed relationship can be a stepping stone to a better future. A relationship may fail for a wide variety of reasons, and sometimes two people just grow apart and no longer want the same things from life. If you have a failed relationship then you should pick up the pieces and move forward instead of obsessing over it.
There's no point of giving your heart to someone when that someone's heart is somewhere else.
I wish I could show you exactly how I feel for you, and tell you you're the apple of my eye.