Alpha Centauri
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The way I see it, to add to that, is as though cheating is an occurance for a person who doesn't know what they want. Or they want two things they can't have at the same time.
My advice would be, don't commit if you aren't sure if it's what you want and if you DO want it, say no to the quick fling.
No matter how long you've been in the relationship, if you're reasonably happy and just bored in the bedroom, no amount of lack of sexual spark warrants going off and f*cking some other person. There are ways to spice things up, and if the marriage/relationship IS ruined as a result, end it before you play the field.
Cheating is just so unneccessary and needless.
-AC