My wife wants divorce?

My wife wants divorce but I don’t, when we were studying in the collage in 2000 we fall in love with each other after 4year we decided to marry, 2004 we got marry in the arya samaj mandir because we thought that our parent would not agree for our marriage coz I belong to lower cast and she belong to brahmin cast. in same year (2004) she was engaged with some one, that matter disclosed in Dec 2004 about her post marital affair she was dating with him almost 6 months, in this period they decided long term relation like marriage with each other, she also hide about ur marriage to him when I came to know about that I told her " go and get marriage with him" but her new boy friend refused marriage proposal and finally she came to me and apologize her mistake. in 2005 she get engaged with someone this matter was disclosed by her female friend and I told her if u r not happy with me plz give me divorce then she told me I cant do that if u force me I will commit suicide . I thought that she apologized her mistake this time by heart and we are leaving separately we both decided we disclosed our marriage when her elder sister's marriage will fixed with some one. In Between we met with each other and we had relation like husband and wife, in 2008 she aborted a child and she told me " I m always with u" now her elder sister’s marriage is fix and now she wants divorce, after that I disclose all the matter before her parents and they also want divorce, after 10 year's relationship she wants divorce is it fair? and she told me “plz forget every thing and we are not compatible with each other and divorce me other wise I will commit suicide” a now I m into deep desperation and some time I thought to committed suicide ..........plz give me a fair advice