mt_joy,
You are saying that if in any agreement, even if not married, an example of cheating might be, say, when one partner doesn't tell the other he/she is looking for other endeavors romantically or sexually or anything, yet giving the partner the idea that he/she is being faithful to the agreement.
So it's a matter of "agreement" or covenent and keeping faithful to that whether married or not.
I have heard of some people who want to appear to regard fidelity yet not be, and others who may be tempted not to remain faithful, yet remain faithful afterall. Oh well.
