I think after lot of thoughts topic become little complicated but I think a guy or girl can live their life as they want but they must take care that it will not make any bad effects on their loved ones.if extramarital affairs can give happyness and peace to someone than it is good but I dont think it can fullfil desire of love in a persons life.these type relations always have some sort of distance.There is only a way if relationship is not working,,and u think it will never gona work,, break it n go for new one or stop running behind love,,sometime people dont have love of partner,,but have lot of love in other form,,search for that.