Let her be. If you really love that person, you'll understand her situations. Be fair with her and give her a break! You don't know, maybe in the future, she'll realize that you're really the one that should have been loved by her.

Move on with your life! It's for the best ! You will only loose your time because you cannot change what his heart feels... I know it because i was there ! So it's better to find the courage within your self and move on !

I agree with Moni as painful as that may seem. Don't ruin someone else's life through your unrequited love.

Forget her/him, starting a new life by yourself

if you love someone yet that person does not love you in return, it is best not to follow through with that person, you should find another women/man becauses if you try to express your love to this person, you might risk jeperdizing(messing up) set person's relationship with the person he/she loves