What makes a partner cheat?

lack of love and understanding are enough reason for it.

lack of love and greed... if you love your partner so much, then you will be content. then you wont find any reason to cheat coz you see they you are complete with your partner. ^_^

i think that there are plenty of reasons for this: 1. if u get a better one than the existing partner. 2. if u don't find ur partner's behavior in tune with u. 3. u feel that ur partner bores u. 4. u don't have enough time to carry out the relationship. 5. last but not the least that the relationship must have been started off due to some selfish motive and after finishing of the motive there is no interest left in the relationship. have a nice day on mylot.