well this is very important issue here going by the notion past is past,u cant undo it,afterall everybody has got a track-record,the things can be justified but i guess in two important issues,it fails 1 u never know polygamy/polyandry can result in the transmission of STI(sexually transmitted infection) becos u never know who is infected n who not n above that u dont ask for health certifiacte b4 making gf/bf 2 u may compare between the past n the present partner n may fantacize the old 1 though physically u r with the new one this rocks the sexual relation of both the partner n may result in frustation which after all isnt good for helathy relationnnnnnnnnnn okay yo ta bhayo past relation ko kura? wat if if ur present bf/gf having sex with other while in realtion with u? forget n forgive or just kick his/her ass i have seen many giving a second chance becos they love the partner so much that the partner being unfaithful once doesnt deter them from loving them again hoping next time it doesnt happen........... bikash kc