"I think I know why people cheat."

"Oh?" I looked up from my lunch. "Do tell."

Jimmy cleared his throat. "Okay, here it goes."

He put his fork down and leaned back in his chair.

"In every relationship, people's needs are fulfilled in varying levels. 50%. 60%. If your relationship fulfills 80% of your needs, then you're one lucky son of a bitch. It's unrealistic to expect that a relationship will fulfill you a full 100%.

"Let's, for argument's sake, say that a woman is being fulfilled 80% of the time. She's very happy. Then along comes another guy. They become friends and he fulfills the other 20%.

"Over time, she starts to think: Hey, this guy is pretty cool. He does all the things my boyfriend/husband doesn't do. So she cheats on him with this other guy.

"Now say she leaves her boyfriend/husband for this guy. After a while, she discovers that this guy only fulfills her 20%. That's a bad deal, right? Because she just dumped an 80% for a 20%. Or even if this new guy is 60%, that's still not 80%."

I nodded. "Interesting theory man! I totally agree that it's very difficult to get 100% from any relationship. And that's why everyone needs their own friends, even in a relationship. Like, your girlfriend may give you lots of support and companionship, but then you also need your drinking buddies for when you want to clown around and talk about stupid shit."

"Exactly!" Jimmy waved his arms about emphatically. "Some girls believe too strongly in trying to find a man who gives them a full 100%. But that's almost impossible! Or at least, super rare."

"You know, I can see this principle applying to other things. Like with work. Say your job only fulfills 80% of your needs. Your job is great, but it doesn't give you a creative outlet. So you fulfill that other 20% elsewhere, perhaps with freelance work or weekend hobbies."

"Totally man! That's exactly how it works."

"But say…" I scratched my chin. "Say the woman is being fulfilled only 50% and meets another guy who could potentially fulfill more. Like 60%. Couldn't, or shouldn't she switch over then?"

Jimmy shrugged. "True, I guess she could. I don't want to advocate cheating, but I guess she would be better off with the other guy than."

"I definitely don't want to advocate cheating either. Also, how could the woman really know that another guy could fulfill more? How could anyone ever know? It's just as likely that the new person could fulfill only 50% also. Or less."

Jimmy nodded and ate a forkful of Kung Pao chicken.

"You've heard of the 80/20 rule, right?"

He nodded. "I was just thinking about that too."

"How would that apply here?"

"Good question." Jimmy swallowed. "So the 80/20 rule says that 80% of your needs are filled by 20% of your actions, or something like that, right? So what if the 80% for the woman is just unimportant stuff, and her really important needs are the 20% that the other guy is fulfilling? Then the other guy is really the one fulfilling the more important aspects of her life.

"But if that important 20% is already within her 80%, then that other guy is just providing 20% fluff. If she dumped her boyfriend/husband for the other guy, she'd be totally sorry. Hmm." Jimmy paused and arched his brow. "Does that make sense?"

"Totally man. Good theory here. Deep stuff. What do you call your theory?"

"Call it?"

"You need a name for it."

"Oh." Jimmy scratched his head. "Maybe the Fulfillment Theory or the Cheating Theory. Hmm. I really don't like the Cheating Theory, because that sounds bad. Plus, it's not just about cheating. Let's call it the Fulfillment Theory."

"Cool. Jimmy's Fulfillment Theory it is!"

. . .

What do you think of Jimmy's theory?