It's been about five months since Kourtney Kardashian's ex-boyfriend and baby daddy Scott Disick entered rehab, but the reality star may be going back to his old ways. While Disick has been apparently trying to prove himself to Kardashian for the sake of their children, new photos of him partying it up on vacation seem to prove that he's fallen off the wagon.

Disick, 32, was seen partying at his friend Joe Francis' vacation home in Mexico surrounded by several models, and he shockingly had a beer in his hand. This all took place while Kardashian was home in Los Angeles taking care of their three children Mason, Penelope and Reign.

"Scott has been switching off between beer and mixed drinks and smoking a ton," an eyewitness said. "There has been no shortage of models around him at all times. He always has a drink in hand. He seems like he's in a dark place and not very happy."

Last summer, he and Kardashian broke up after nine years together when he was spotted in the South of France with his ex-girlfriend Chloe Bartoli. While Kardashian has not specifically commented on the photos of him drinking, she did send a cryptic tweet early Saturday morning, just days after the partying took place.

"A smile hides my pain, a hug masks my heartache, and a laugh covers my tears," the tweet read.

Disick decided to speak out about the trip to Mexico just hours before Kardashian sent out the tweet, and he set the record straight on the photos of him drinking. "The only thing I find unfortunate is that I'm seeing a ton of press saying, 'Scott's off the wagon and he's this and he's that and he's all these things,'" he told People. "The truth is I never lied and said that I was never going to have a beer again. I never said I was never going to have a cigarette again. I never lied and said I was never going to go to the beach again. I never lied and said I was not going to be around my friends and their girlfriends and girls and friends."

He went on to explain that he's not "on a crazy mission of destruction" and that most people took the photos way out of context, especially since he mostly went to rehab for his addiction to sleeping medication.

"I was down there hanging out like any other single 32-year-old guy would be," he added. "The truth is I just to live my life and I want to have a little happiness and a little balance. The truth is rehab did help me and now I'm just trying to be responsible. I'm not out here trying to get wasted, but you know what, I will have a beer on the beach. I'm not doing drugs, I'm not doing anything insane, so I think people just need to relax...I just want to try to live my life."

He then brought up Kardashian and the children, and he made sure to point out the fact that he is single. "I'm not sure I can stay home every single night at 32-years-old and be sane," he explained. "In the end, I'm trying to live my life. I'm trying to live it healthy. I'm trying to be there for the people I love, which is Kourtney and kids, but you know what, we're not together. I'm single and I'm trying to keep my mind off things...at the end of the day I think people just need to understand that I never lied about anything about myself. I am who I am. I do what I do, and enough is enough."