I have friends that will ditch for a boy, not realize it, and deny it when you confront them, but when they break up with their boy, and another friend does the same thing, they say, "Why do you leave us for boys?" and my other friends say, "Because you did it to us..." Which doesn't make it right, but why does everything have to be complicated by guys...
I'd never let a relationship with a guy ruin a friendship.