Triangle

I love her she's with him, as she kisses him who does she see? She may see two, maybe sometimes me, I always knew there was three, can't love two... just left of center inside right triangle, I am one, a number in this triangle blowing out my unlit candle... Sometime she loves me as she embraces him. How did this begin? Can love ever be? Will this carnival ever end? I want to be first a one and only love, no matter what I do, I remain at number two, a star beneath the moon...