Man now I am being serious, I had a problem with a girl in the same situation. Except I let it go on for a long time and I kept yelling at the *****, but she thought that I was going to be mad if she told me. She lied about being home. Turned out she was ****ing my friend, so we broke up. Then her and my friend got together. I told him do what ever the **** he wants I dont give a ****, but just treat the ***** like a ***** and get even for me, and he did. Then she tried gettin back with me all crying and shit saying sorry and I just told the ***** **** you and I hope you die.
But really break up with her and save yourself from the bullshit.