Past lies are like cancer, it might go away for awhile but you always worry that it will come back again. Action speaks louder than words so you'll have to just show her you are legit through actions. Its hard to trust again, many people can never fully forgive and move past it as much as they want to out of fear of being hurt again. Tell her and show her why you never want to hurt her again.
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?