A Messed Up Triangle/ Square Love

I love him. He likes my best friend. She is in love with her guy. And nobody knows who he loves. I know who he loves. I know how he feels for her and I still keep trying. He knows how she feels for her guy but still tries to be with her. She doesn't even like him as a friend and keeps going back to her guy. Her guy won't or can't choose between her and another girl.