HEy pyaaroonepal,
you say you love her, but you don't wanna accept her becoz she loose her virginity, 
Thats clearly tells that you do not actually love her, but you love her sex. 
Brother, be open. I know its hard, but if she really loves you and you really loves her, why she being not virgin wana kill your relationship. 
I have been to your case, and i used to think in the same way, but you guys should promise each other that you guys wil not flirt with any third ppl. 
If the girls is playing with many guys , then there is a reason , but if she loves you and if she is sincere with you , then there is no question for you to leave her. 

In these kinds of matter, if boys do not support girls, they will get more and more week and girls tends to do involve in bad activities, 

Brother, i tell you, if she really loves you and if she is very sincere and faithful to you, just go to her and accept her as a life partner and atttach your heart with her. She may built strong faith on you and could have strong relationship in future. 

May God bless you .