why some time girl sacrifice and some time boy sacrifice ?

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hi to all well question is arrieses in my mind which i share with you i am 21 years old and i have watched alot seen and meet the alot of those persons who are students and become a lover . i am also student in my life recently i saw a critical case . i saw when the boy and girl become in love so they are faces alot of difficulties in his life . one day a beautiful girl came and get friendship from that person who is in love with other girl she is her class mate after one or two weeks the other girl leave him and the first one sacrifice her self and some times there is one boy and two girls on the other hand there are two girls and one boy .