Younes, 25, documented the trip on his Instagram, but failed to share some very steamy photos of his hugging and giggling with former Las Vegas waitress Jordan Ozuna. A source exclusively told Radar that the two were caught kissing and getting very handsy!
The Shade Room shared screenshots of the PDA snaps in a scandalous Instagram post, on which Kim, 37, wrote: "Nice pics from your 'boys trip," and added a Pinocchio emoji.
Khloe, 34, echoed the shade, commenting: "Alexa play "heard it all before" by Sunshine Anderson."
RadarOnline.com readers know Kourtney, 39, and Younes started dating in 2016 after meeting at a bar in Paris, months after the KUWTK star broke things off with baby daddy Scott Disick.
Younes was "always a rebound," a source told Radar. "No one expected it to last this long."
After his controversial Mexico trip, Younes seemed to laugh off the Kardashian hate.
"They really want me to be the bad guy f**k your Hollywood bulls**t (can't have fun with your friends no more) ...where are my 12 other friendssss? Nice catch tho," he commented on his PDA photos with Ozuna.
He also shared another message in which he told fans he was "not attached to this 'life'" so criticism would not bring him down.
Radar readers know Younes and Kourtney just recently got back from a romantic trip to Europe with the star's mom and kids. What went wrong?
Do you think Kourtney Kardashian is better off without Younes Bendjima? Let us know in the comments below.
We pay for juicy info! Do you have a story for RadarOnline.com? Email us at email@example.com, or call us at (866) ON-RADAR (667-2327) any time, day or night.