do it all over again?

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so there is this girl i love and known for ever but it's been about a year ago and this last summer she was in love with this guy crazy in love but he doesnn't like her back so when she broke up with him i told er that i love her so much and all she said ok let's be together but the tomorrowx after she saiid that she want to be alone blabllabla and ended up with the same guy untill she found out that he was kinda cheating on her so she apologised to me and said that she has made a huge mistake to me...we go to the same school that i got transfered to and she says hi and good morning and sometimes i see her looking at me at school althought she has been dating a few guys lately but the relation ship didn't work out and each time that i talk to her on fb she opens up to me and talks about her problems and stuff and that she want's to kill her self and made some wroong desicions and stuf a,d lately she asked me if i'm single so i'm wondering if i can ask for her number or even ask her out; so what is your advice