This is a serious love problem pls help?

i am in love with a malaysian girl basically she is an indian who is the sister of my clmate...but my clmate knows about me that i have done some mistakes together when we studied together in hostel...but now he is not accepting my love how can i make him and his parents accept our love....we both are terribly in love....pls say us a way tht our parents should accept our love....