The love triangle or more is normal in the society.You love her, he love her, other person loved her, too. Sometimes, in the love triangle, there is one person should give up and just live the other to have the one they love.It is depends too in the situation if the girl loves you and not your friend, maybe your friend will understand you. And if the girl loves your friend, then live to your friend to have the girl. It is hard situation but not too complicated I guess. For me, if I and my friend love the same person, I will give it to her.I want to see my friend happy and I hope she will feel the same with mine.
This scenario is the same with Boys over flowers, the Korean Novela. Where two character love Gum Jhan Di, and the other guy didn't pursue his love to her because his best friend loved her too much.This is a good example of letting go.