I think is not only possible but it happens very often too.
I am not even talking about cheating and not be caught which I am sure it happens but even if they get caught many would forgive them so in a way to me that is getting a away with it too.
I have cheat and I have being cheated in the past, looking back both things would have being avoided if I would have be more mature and careful on who I dated. I didn't broke up for that reason so I guess you can say we got a away, but I am not married to them and I do regret it so looking that way, no we didn't got away.
I think that what have change then and now, is stop thinking that there is a Mr./Mrs. Right (there is not), understand that is always is easier to be nicer when you don't have to deal with BOTH the good and the bad of your couple, understand that even with all that, and trying your best it is a chance that you stop loving that person but that you married a person that deserve your honesty as well as your self.
AND
find somebody that understand and agree with this too.
It goes both ways to make it work or to at least walk away with your head up.