Something I Can't Seem to Understand

She asks me, "Why can't he just be faithful to me?" He has feelings for another girl. He doesn't show them, but she knows it. I feel bad for her, but its hard too. She gets with other guys at parties, she talks about all the boys that are better than he is, how much he drives her crazy, how much she likes a few other boys. It drives me nuts. She isn't faithful to him either.
She really doesn't understand how lucky she is. She has everything. She can pick and choose. She gets what she wants when she wants. But she still complains about it all. It doesn't make sense to me. I'm ready to snap.