He Is Cheating On Her

Well, ok you're friends. But you noted the girl as you BEST friend. Don't you think you owe it to her to tell her what's going on. Put yourself in her shoes. Just think of what YOU would want her to do if your BF was cheating on you.

Secondly, how could this guy do this to you? He's gotta know you're best friends. It's a really awful spot he just put you in. He maybe confused but it doesn't give him the right to betray your friend.

Even if he is your friend, you gotta do the right thing. What YOU think is right.

I hope that helps.