HAH.
It's funny because I read your post and wanted to reply: Don't waste your efforts, she is still emotionally tied to this ex and until she has severed ties with him he will probably always be around to interfere with your relationship if you did enter in to one. Most likely you would be used as a tool to make him jealous.
Sometimes I'm just amazing.
Pity it's too late to prove it!

Well done on dodging that bullet sir, life would have been miserable. I hope you'll find a much more worthy woman to invest your efforts in to soon.