The girl im best friends with, and totally crazy for, is still in love with her ex. advice?

i started talking with this girl about 6 months ago when i broke up with my girl friend. i wasnt looking for anything romantic, just a friend. I had no clue she was interested in me until about 4 months ago. we made out a few times, and hung out ALOT. i fell head over heals for her. then the kissing and cuddleing stopped. I asked her why, and she said its cuz she realized she was still in love wih her ex from a year ago. they dated for about a year, and had a really bad break up. They havnt spoken in about a year, but last week she told me that she saw him and that they talked about alot of things. She told him that she was still in love with him. I told her how i felt about her about a month ago. but now she keeps talking to me about getting back together with her ex. she told me that she has alot of feelings for me, but they dont "compete" with her feelings for her ex. any advice?