Most painful thing is one sided love when you love someone but are not able to express your feelings to him /her because he /she love someone else.
Love is not always about gaining sometimes its about giving too .Giving happiness to person whom you love most .
You never know how much i love you
You never know how much i need you
You never know my true feelings
You never know tears behind my smile
You never know how much i was crying in lonely nights
You never know sacrifices i made for you
You never know that i leave the world to spend time with you
You never know the pain i am suffering from
You never know that life without you is nothing for me
You never know because you were never in love with me
You never know how much i love you
One sided love is most purest form of love when you know that you never get that person but you still love him/her without any expectation. You may have a strong initial attraction to someone and envision a great life together. You have optimism and hope for the future.