what do you think why men cheating?

Simple answer: Men are hunters.... They like the HUNT... When the hunt is done then some Men start a new hunt

i think its because men get bored they want more than one they think they can get how many they want like some kind of competition to see who can get the most .. some men actually have got hurt in love and then they turn in to "players" and cheat etc.. for some guys they get bored in bed others they didnt really have much interest in the girl and therefore leave her for the next best thing that comes along

Yes I believe that's not fair. Since I am a woman and I think those reasons just not right. Actually there are no righ reasons for cheating. If he doesn't want her anymore just leave her. And if he doesn't find her girl is not sexy anymore, talk to her about that. That's why people needs comunicate to their partner. So that they can tell anyone about their feeling.