How come ';cheating'; means ';to be unfaithful to one's spouse';?

I have heard this word frequently being used as an accusation of one person of having a secret and sexual affair with another person out of wedlock. But shouldn't cheating supposed to mean stealing or plagiarizing data to advance in something, but that something does not bring any good to any party and can kick the cheater out of school? So, what is the connection between ';cheating on a spouse'; and ';cheating to gain an unfair advantage';? How can one ';cheat'; in marriage?How come ';cheating'; means ';to be unfaithful to one's spouse';?
in marriage you are supposed to be dedicated to that one person


marriage is a contract saying you will be faithful to your spouse


when you have an affair with another person you are ';breaking the rules';


so it could be compared to cheating in a game


you are not doing what you agreed to do


How come ';cheating'; means ';to be unfaithful to one's spouse';?
since i've been a victim of this for 16 years i can vouch for the


unfair advantage and no good come of it answer,.......he gets all the attention he wants from anyone he chooses and i get nothing,from him but whats left and that is not much, but hurt, misery and pain, so all the definitions are correct,..


and he can't understand why i'm so negative and mean as he puts it,..my needs are never met.. he's to busy trying to please his new mates so why should he bother fixing his mess he made of us...



Cheating means ';violating accepted standards or rules';





As in the rules of marriage.





http://www.google.com/search?hl=en%26amp;rlz=1…
Its just a word with two different meanings like umm? Punch? It can be a drink as well as a hit with your fist! Know what i mean?