Probably out of comfort, you guys were together for 4 years so she probably still feels some affection towards you. I'd keep your distance, don't let her play hot and cold with you. Find someone who wants to ride that pony.
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?