Is she one of THOSE girls: "I can't get it MY way, so I don't want it at all so there." Seriously she needs to grow up. Assuming she's a woman of your age this is PATHETIC.
You really need to start getting the point across to her. It's about communication and work. If she is truely unwilling to hear you out, help you, work on it, suggest things and deal with some success and some failure rid of her- she's not relationship quality. Wouldn't you agree?
Honestly I truthfully can relate to the hurt feelings by not being able to make him cum. I totally understand however I'm not a whining little child about it! I listen to him explain to me- sometimes it happens, it's not my fault (I DO foreplay) and he 100% finds me attractive. I don't huff and puff and refuse sex. I listen to him, understand, ask if he wants, needs or craves anything. She is not doing any of that or attempting.
Stubborn or not stand your ground, MAKE her listen. Explain how you WANT to help and work on this issue WITH her.
One more thing: How exactly does sex go when it does happen- does she even attempt to arouse you?