If you are giving your all to someone

Relations are like jobs, yes there’s work involved, sometimes hard work, but if you hate going to it every day, if it’s no longer more joy than trouble, if the passion to work at it is gone, if it’s just a job, then it’s time to find something else. ~ George Colson

If you're giving your all to someone, and it's not enough, you're giving it to the wrong person.