sometimes i feel like I'm in love with you

In my opinion, love is strong and never unsure of itself. If you love, you love, period. There's no "sometimes" or "I think" or "things change" or "I did but not anymore." You either do or you don't.

So. My diagnosis? She's trying her hardest to get over this lost love of hers, and thinks maybe she can find that in you but doesn't want to pursue it for a combination of fears - fear that she'll be hurt, fear that you'll be hurt, fear that it'll work and she'll forget about the other guy, fear that she isn't secure enough in herself to warrant a healthy relationship right now (which obviously, she isn't.)

My response would be simply "When you figure it out, let me know." Then don't speak of it again. If at some point you love her, tell her, but don't expect anything in return.

Jam it back in, in the dark.