Try Harder, Scott
Then several months after that when it seemed like Kourtney may be willing to give him another chance, he ruined it by bringing a side chick along on the big Kardashian family vacation. Kim called the girl a whore, it kicked off his big downward spiral. Side pieces ruin lives.
You Go, Kim!
Like her big sister, Kim has always been loyal to her fellas. Unlike her big sister, she's had pretty good luck with her fellas being faithful to her, too. Mostly, anyway.
Rumor has it that Kris Humphries was suspicious that Kim had cheated on him with Kanye during their infamous 72-day marriage. It's possible, but then again, everything is, you know? That's what makes rumors fun.
There aren't many stories about Kim's boyfriends and husbands being unfaithful -- the famous ones, anwyay -- but one little rumor that goes around from time to time is that Kanye has been and perhaps still is involved with Italian fashion designer Riccardo Tisci.
Khloe, Honey ...
As you surely know, here's where we really get into some sad, sad stuff -- Khloe's relationship history.
Khloe's relationship with Lamar was the first widely publicized relationship she was in after the family got famous -- they were married in 2009, shortly after they met. The first time he was rumored to have cheated on her was three years later, when tabloids reported that he'd gotten friendly with another woman at a strip club in Washington D.C.