Most Helpful Girl
No, no no! Girls rather honesty. It may kill us on the inside but we'd much rather you tell us the truth than to lead us on, or to act an ass until we break up with you. That's cowardly. Be a man and tell her the truth.
Most Helpful Guy
You'll just be proving that her shitty behavior is okay. If you break up with her she will learn that her bad attitude should change.