How could she do this to me?!?!?! I never did anything wrong and I aways cared for her.
...... I broke up with her because of her religion and so she'd be happy and she backstabbed me.
She didn't do this "to you." She was too manipulated by Jehovah's Witnesses and she finally
broke out of their demands upon her mind. She didn't know how to handle breaking free, and
got out of control.
Likely, when she broke up with you, she meant what she said and wanted to be a good JW.
When she broke free, you were not there getting drunk with her, so the nearest guy would have
to do. When she sobered up, she felt bad about herself and might have wanted a "bad boy"
nearby.
Regardless of any advice you get here, it hurts. I doubt that you are finished with her even though
we recommend walking away. You feel some sort of responsibility/care for her. So it is going to
hurt more before it ever might get better. If you can't walk away, tell her you are moving on
with your life, but are always available to talk as a friend. If she takes you up on it when she's
on the rebound from one of these destructive relationships, don't have sex with her. Build a trust
or just listen. Catching some disease isn't worth it. Even if you don't get a disease, you would
become just another guy who used her.