Girls and Boys Can Never Be Just Friends

I am in love with my best friend. He has two best friends. His other best friend is also a girl and is one of my best friends. She is also in love with him. He is in love with her sister. Him and his other best friend have been making out randomly all summer, without me knowing it. He kissed his other best friend the same day that he kissed her sister. He held and made out with his other best friend in MY bed hours before doing almost the exact same thing with me. His other best friend kissed his best guy friend. His best guy friend knew that they had kissed, but kissed her anyway. Everyone is heartbroken. All our friendships are falling apart. I love all of them so much..