Once buddha came to preach his disciples. He had a beautiful piece of cloth  in his hand. Disciples were surprised as it was very unusual to see buddha with anything in his hands. When buddha was addressing everyone, he started tying knots in that piece of cloth. After tying four to five knots in that piece of cloth, he showed it to everyone and asked them, "Is this same piece of cloth which I had bought initially or is there any difference?"One of disciples said, "Lord, it's same but it condition had changed."Buddha said, "Correct. now if I wish, is it possible for me to bring condition of this cloth back to it's original form?"Another disciple replied, "Lord, it is possible but you will have to untie all the knots from that piece of cloth."Buddha asked, "How would you untie the knots? will knots be untied by pulling the piece of cloth?"Another disciple replied, "Lord, if we observe carefully and figure out exactly how knots have been tied then it will be easier to untie the knots.but if we don't know that and try pulling the cloth from both side then we might make the knots tighter."Buddha said, "Exactly. many time we argue and quarrel with our friends and family. if we insist that only we are right then knots become stronger."Then, as buddha untied knots, he explained, "If we analyze reason behind knots and without expecting anything from other person, try to remove root cause of knots then we can easily untie all the knots. relationships become smooth just like this piece of cloth." 
Let us try not to have expectations from others, be happy with what we have and make others happy too. 