What hurts you the most in your life?

In my life, there are tonnes of things, situation and feelings which hurts me but sometime there's something which hurt me the most which is to see the person you loved or loving love someone else. This time, I'm going to talk about few situation which related to feelings especially love. I always do have this question running in my mind, why love sometime can make us happy and make us felt we're the king of the world but sometime the same love can drawn to the sea. I'd tried to search for the answer but guess, there's no answer for it, correct me if I'm wrong!

First situation is where to see you someone that left you is loving someone else. Is not because of jealous but it's hurt to see you know when the other person make you felt like am I no good or what is wrong with me? I mean I love him with honesty, sincerely and do the best for him. I'm not saying I'm good or to show off but I always want the best for the person that I love, I want that person to be happy always, keep smiling :). Even though I know the relationship will end up no where but I took the responsibilities to show my love but at the end of the day it hurts me back.

Second situation is where you know someone, be friends with him, be there always for him whenever he need you, make him happy, comfort him, motivate him, make him become stronger knowing you yourself are weak but yet willing to help him. One day, you found that you've got feelings for him and when about to express your feelings to him, he found someone in their life. It hurt you inside but you wish him all the best and congratulation, say some nice words with a fake smile. 

Be there for him even he is with someone else, kept your feelings towards him inside your heart. Days are flowing like rivers, you tried to express your feelings even you know it's wrong but he treat you like a doll. You message him more than his lover do, accompany him whenever he felt lonely but there's no one comfort you or accompany you when you're lonely. You kept all this in your heart, hard to let it out, there's no right one to share about it, there's no right one to comfort you, always live in your own imagination world with him.

One day, he make you felt you're worthless, he make you felt like begging for him for accept your love, he make you felt your love is so cheap but still you stand still hoping one day he'll accept you in his life. You tried and trying your level best to make him not to think you taking every chances to show your love or using any kind of situation to express your love.

You know that he'll never be yours, you lied to your feelings when ever he ask what kind of feelings you've for him. You lied to your heart in order to protect their relationship, you pretend like normal, like you've no feelings for them, you make yourself as a doll which have no feelings. You know it is wrong to love someone who already loving someone else so you buried your feelings and crying inside while smiling outside.