It is such a wonderful feeling if you love someone and he or she loves you too. He or she exerts effort the way you do. But in this case of loving without loving you back is such an unfair feeling that someone will feel. Just like the saying " It's better to love someone you can't have than having someone you can't love". Sometimes, we humans we do not appreciates those who exerts effort for us,who care more to us and the person who is always there for us.