does real happen because one of them is unsatisfied? or just because it has to happen meaning one can fall in love even more than twice?

NNNnnnnot entirely clear what point you are trying to make, but there is absolutely no positive angle to cheating.

None.

People who cheat, do so because they excuse themselves from having a sense of personal honor. Everything else is just cover stories and self-delusions.

Depends on the cheating.
I mean there's a difference between things like "I got drunk as hell, we were flirting, they followed me to the bathroom, and it happened, I don't even know their name," and, "I went online, started a profile on a dating site, we spoke for 6 months online, we met for lunch, then we met every day for a year and started having sex, now I'm leaving you for them."


Biologically, you can't fall in love/pair bond with more than one person at a time. Pair bonded love retrains your brain. You build associations, emotionally, that work against lust for others. You see a pretty girl, you get horny, you get horny for your partner, lust automatically brings up thoughts and images of your partner.
It also retrains the release of hormones to help offset lust, so you aren't as motivated to go chase.
Of course, it's subjective, like pain.
It works better on some than others.

Also, you ever experience something in your life that made you just laugh like crazy. Then 2 years, 10 years later you are reminded of it and you laugh just as hard, just can't stop laughing?
That's like one at a time, biologically determined love.

You ever go to a comedy club, had a great time, laughed loud, and long, rib splitting? Then you watch the comedy routine alone, and you're just like "meh," or you find yourself smiling a bit, and then repetitious viewings you laugh a little less, or you find yourself having to try and make yourself laugh?
That's social love.
As long as you are in the club surrounded by people giving you feedback, which is in essence telling you how you're supposed to feel and behave, it works and feels good.
But it doesn't last any longer than all the other people doing most of the work for you and you don't have to think about it (outside of rationalizing).

If you want to call the latter "love" (which a lot to most people do) then you can fall in love even more than twice. You can fall in love with as many people as you want. Although personally, I would label it more along the lines of "inability to offset social duress and cues for the sake of selfish gratification and conflict avoidance," but it doesn't have the same connotations. And most people just like the labels that make them feel special and that they're good.

If someone is unsatisfyied....do something. Therapy, talking, divorce,etc. Cheating is not ok. The cheater can't blame what they did in the other

You Go Girl