why do most people in relationships cheat?!

it doesn't matter if your a guy or a girl...any ideas as to why it trigger? and how it can be prevented?
When it comes to a person's contentment there's always room for more. it's part of being human to always want more, you just have to know how to deal with it. And dont use that "i'm only HUMAN" as an excuse to cheat because nothing can be lamer than that. Cause if each one of us make it as an excuse, it will not be a better world for us...how come that we're given brain & emotions...what's the use? A person actually cheat, either a girl or a boy, married or in a relationship, probably it's because of the thrill that comes with it. I believe especially if the boy or the male specie is the one. Triggers? probably they do this because there are expectations that are not met. They usually find it in another person. Prevention? in many relationship, there will always be a test in TRUST, how will the other person say no to such temptation that might ruin the relationship, so it is up to the couple how will they handle such temptation so that the trust in the relationship will not be ruined. Cheaters wanted more..for ego booster!! one should be mature & respect his/her partner to avoid cheating...para wala nang pahirapan...or guess some people cheat because of the thrill (will I ever get caught? how good of a liar am I?) and others to satisfy their curiosity. Some cheat beacause he/she and his/her partner have reached their relationship plateau. Yung sobrang complacent sa relationship nawawala na ung sweetness ng dating nasa ligawan stage pa lang. People cheat as simplest way to escape, try new things(curiosity kills the cat!!-remember that!), boost own ego and be ahead of the game. but no matter what the reasons for cheating it still wrong & in the end the people who cheat suffers. "karma" is the word for that so live fairly..it's hard cause no one is perfect.