I think she wants to keep things kosher with you in case things don't work out with the other guy. She knows you still have feelings for her and may be using that to her advantage. Don't be her fall back crutch. She chose to walk, let her walk.
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?