The OP isn't "normal" by any stretch of the word.
She is chaotic, and utterly incapable of handling a relationship. Now that she's found a guy who she actually could settle down with.. oh no, she can't handle that, it's time to inject chaos to destabilize it.
Who injected the chaos? She did.
Who spun miles of yarns to justify her need to run around being chaotic? She did.
What's her ultimate goal? To run around whimsically satisfying emotions, or to nurture, maintain, and grow a loving relationship? She is wholly disrespectful of her husband, even inventing a way to define it as "his" fault - as if absolving herself of blame makes infidelity either appropriate or acceptable.
The OP is human - not because she cheats, but because she needs therapy and does not recognize it. This is not an uncommon or unusual situation. What is unusual is that America (and, to an extent, Slate) would rather glorify the action of cheating instead of discussing its long-term effects.
Judging the action as good or bad isn't the point - the point is to guide suggestion and recommendation by what's ultimately good for her as a person. Cheating isn't "OK" just because it can be done.. nothing happens in a vacuum.
Cheating is to an extent sociopathic (because you are a horrible person when you know you're causing pain to someone else and don't stop) and is nothing more than re-enacting trauma from the past. What, exactly, do you think caused the labeling of random high-risk encounters as a "good" thing in your brain? That's not the case with everyone.
What's the solution for people who find a rush of adrenaline when they cheat? Stop. Look, this isn't tough - you take out the garbage every day even though you don't want to. You have to make the conscious effort every day to choose long-term gain over short-term (ultimately fleeting) glee.