Hey wheres the couple??!?

okay so this girl named francesca had a crush on this guy named christian.... they were like bestfriends before they went out and till this day they still are. since they liked each other, he asked her out and she obviously said yes:] but it only lasted a day.. she said she only saw him as like a brother to her. so he was hurt but he moved on. they still stayed close friends. over the summer he went out with another girl and she went out with someone else to.. yet she would tell me everyday how she was bothered by him going out with someone else and how she still had feelings for him. she just didnt know what to do.. time went on and christian and his girlfriend broke up.. francesca went out with another guy named aaron that she did the exact same thing to him that she did to christian. only now they dont talk anymore. So Francesca is my bestfriend yet she hangs out with christian more than anyone.. and she tells EVERYTHING to him.. thats obviously a sign that she likes him. i think anyway.. i mean she doesnt talk to like anyone else. He likes her but he wont admit it to anyone because hes afraid if he asks her out again shes going to do the same thing. how do i find out if she really likes him? what can i do?