What do you think about this girl who recently broke up with her boyfriend? (I'm a 21 year old guy, shes 18)?

about 2 and a half years ago i was together with this girl, on and off for about 2 months, then she broke it off with me for no real reason other then she claimed she just lost the "connection" and that her parents said she was too young for me.. for the ped year and a half shes had a bf.. and we really havent talked at all.. so a few nights ago she IMs me and starts askin what im doin, what i been up to etc etc.. we talk for about an hour..i ask her for her number and shes like "boo, u didnt keep mine" so she gives me it and im like do u have mine? shes like noo text it to me.. she must have asked me 3 more times for me to give her my number because i kept stalling to give it to her.. then the very next day she texts me, then IMs me later on, thenn facebook requests me after that.. the thing is, she knows that the kid who she just broke up with knows who i am.. you think she has interest in me again or just using me for some reason?