A young boy and girl were enjoying a pleasant afternoon playing outside in their neighborhood together. The boy showed the girl his collection of beautiful, unique marbles. In turn, the girl showed the boy the handful of candy that she had just gotten for her birthday.
The boy proposed that the two of them switch–he would give her all of his marbles if she handed over all of her candy. The girl agreed, as she found the marbles to be beautiful as well.
The boy handed over all of his marbles, but kept one–the most exquisite one of them all–in his pocket. The girl kept her promise and gave the boy all of her candy.
That night, the girl was happy with the exchange and peacefully went to sleep.
The boy, however, couldn't sleep, as he was up wondering if the girl had secretly kept some of her candy, just like he did with the marble.
The Moral:
If you don't give 100% in your relationships, you will always assume your partner isn't giving 100% either. If you want your relationships to be built on trust, you have to be a participating factor in that.
Honesty grows your character. By being honest in relationships, you're holding your partner accountable to do the same. It allows both you and your partner to continuously think about your choices and how you can help (or hurt) your partner and your relationship.