Hmm...by "bringing it up" does she mean throw it in her face or discus how you could obviously, and I don't blame you, have issues with trust? If you are going to work past something then you need to address the issue and not sweep it under the rug. You deserve that, she owes you that.
I'm curious as to why you took her back. Often times people trade in one fear for another. Were you willing to take on the fear of being hurt again by her in place of being alone?
So, so you think you can tell Heaven from Hell,
blue skies from pain.
Can you tell a green field from a cold steel rail?
A smile from a veil?
Do you think you can tell?
And did they get you to trade your heroes for ghosts?
Hot ashes for trees?
Hot air for a cool breeze?
Cold comfort for change?
And did you exchange a walk on part in the war for a lead role in a cage?