Tristan Thompson, who is Khloe Kardashian's baby-daddy, knows this all too well.
As we're all aware, Tristan was caught cheating on Khloe a few days before she gave birth to their daughter, True.
The family were clearly distraught, and now it seems like sister Kendall Jenner is still supporting her sister the best way she can.
Over the weekend, Kendall was courtside watching Tristan compete against her boyfriend Ben Simmons at an NBA game. A video of her booing Tristan has made the rounds online.
But it might not be what it seems...
While Kendall is booing Tristan, Khloe has explained that she was only booing him to defend her own boyfriend.
"Look at my baby heckler I’m dying at Kenny trying to heckle on the low low! #ItDidntWork," Khloe tweeted.
A fan quickly tweeted Khloe, expressing their confusion about her and Tristan's relationship.
"I’m confused by @khloekardashian’s tweets. One minute she’s calling TT out, then she’s defending being in his life, then she’s laughing at her sisters heckling him. I just wanna know where we stand Koko so I know how to feel! ," they wrote.
Khloe responded, "What he did was fucked up and disgusting. What you’re watching is over seven months old. We have gone through countless hours of help. My sister was watching HER man Play against my man… So of course she’s going to heckle the opposing team. Why are you confused?"
So there you go. Not only was Kendall only joking about her booing, but she has a boyfriend too!