Who is good cheater girl\boy in relation?

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Now a days its becoms very common with girl and boy to use eachother just for time pass,but servay says that majority of boys do cheat with their GF.I dont believe this,I have seen many cases how the girls are changing their BF.Even you will say "i love you,will you leave?"Girl say that im not that type of girl who changes their BF like clothes.What do you think?