Love is what connects us to others. It provides us with fond memories of those around us. The truth about love, though, is that it often links our own happiness with the happiness of others. We feel compelled to make those we love who are unhappy, happy.
It is because of our own discomfort in seeing those we love unhappy that we seek out ways to change the situation, justifying our behaviors on the idea that we are helping them. Or, we begin to see our own happiness fade in the presence of an unhappy friend or family member.