She 's Got A Man Yet She Wants Me

:(Hey fellas i got a big prblm @ hand, there is this gurl hitting it on me for sometime now and i dnt knw what her motives are, eventhough she has a boyfriend but frm what i have observed i dnt think things are goin on smoothly with her relationship though they are still dating. We are quite close though-we share thoughts and feelings together infact she tells me so much about how evrybody has been insinuating am alrdy dating her, she confides so much in me inspite of the fact that she has her own man .Infact she has put me in so much situations as to be tempted to ask her out, Damn! am so confuse as to what she wants, though i like her but i dnt wanna be the cause of their breakup. I dnt know maybe she's taking advantage of ma single status, i dnt know what to do? Dnt wanna ask her out cos i might seems desperate if i do.My last relationship wasnt really pleasant so have learnt frm it. Do i shove her off? Pls somebody holla!