Sending Mixed Messages

I am friends with this chic. She's confusing because it's hard to tell what she wants. We hang out all the time and constantly talk. The only problem is that she has an ex-boyfriend that she seems to still like. She brings him up in conversations, which tend to get annoying, but I deal. I'm not sure what to do. I kind of like this chic, but I don't want to make our friendship awkward. I want to tell her that I like her, but I don't want to go any further until she's completely over her ex. She says she wants someone to fall on and start over with, but she's afraid.

— Greg, 21