At some point you have to realize that you have done too much for someone, and the next possible step you can take is just to stop. Leave them alone, or walk away. It’s not that you’re giving up, and it’s not that you shouldn’t try. It’s just that you have to draw the line between determination and desperation. What is truly yours will eventually be yours, and what is not, no matter how hard you try, will never be.
That tag wins all the awards, in the history of ever.