Ok, I’ll make this as rudimentary as possible because you’re in denial and you don’t understand men.
Man marries woman. Woman is 8-9/10. Beautiful, funny, cooks, fun in bed etc.
2 or so years down the line, sex becomes stale or non-existent due to children/time/lack of effort.
Man meets side piece who is a 4-5/10 physically. She’s not a patch on his wife but she’s new p*ssy to him.
Side piece thinks she’s going to get the husband but husband has no intention of leaving his wife because outside of sex, she’s perfect.
Husband keeps stringing the side piece along until he gets bored, she gets too clingy or she demands an ultimatum.
Call it what you want but that’s just in our nature. The amount of married men who I know cheat is almost comical. When a married man talks about being faithful, I either assume he’s only just gotten married or he just ain’t sloppy.
I’ll give women credit though. Most of the time when they cheat, they’ll cheat up or at least unilaterally. I know brehs that have wives who are 8/9 physically but they cheat with women who are 3s at best.
Like I said, new p*ssy is all the motivation most men need to cheat.