At some point you will realize that you have done so much for someone and that the only next possible step to is to stop.
Leave them alone. Walk away.
It’s not like you’re giving up, and it’s not like you shouldn’t try.
It’s just that you have to draw a line of determination from desperation.
What is truly yours will eventually be yours, and for what is not, no matter how hard you try, it will never be.
Life is too short to feel sorry and worry. Cheers!