What should i do?

i was dating this girl for a month and we hit it off well and everything went pretty fast, then she like disappeared/ran off cause she was "scared." We recently started talking again and both of us are reminiscing on our relationship before. i spent 2 nights w/ her 12-3 am and 12-2 am jus talking, staring at the stars, listening to our "old songs." i also found out that she was dating another guy and he ended up cheating on her. i know this opens up the possibility of me being a rebound guy, but i just need advice on possibly what the girl could be thinking and what i should do. i'm currently trying to stay unattached and jus flirt/play (i'm scared of getting hurt / putting myself out there) but it isn't working out that well for me because i think i still like her. (she told me about how one of the things we did was the cutest thing ever, we were laying our heads on each other, and at one point our faces were centimeters apart) how am i supposed to read this..girls are confusing >.O;