Critical Situation

My name is Gowtham I am working In a Call Center I am in love with my team leader But the terrible thing is She is also I love But the worst part is the person is not me someone... I have already proposed her she didnt denied but she told that she is in love with some one for past 4years which i already know.... But tells there is know way to leave him but if that boy wont marry her in some cause.she tells that then i will be thinking of u.... But i will waiy for her till my death and i love her more than any thing in this world....Even now while i am texting to her she Texts me as dear, sweetheart,honey and i too even texted her the same and more even i have always saying to her that u are my wife.. But she didnt avoid me for talking like that she too likes it...so please guide me sir but i cant leave without her is there any other way to marry her.............?