It was a mantra Presley Gerber would often come back to: ‘Recovery is about progression, not perfection.’And for a little while it seemed as though he really was making progress.The only son of supermodel Cindy Crawford and businessman Rande Gerber was articulate as he spoke candidly to fans in social media videos earlier this year about his wellbeing and confessed he had ‘started finding my way back to myself’ after years of drug addiction.The tide looked to finally be turning for Presley.But, tragically, those lifelong struggles started to rear their ugly head once again, with the 27-year-old slowly losing his grip as he fell further into a spiral these past three months before his sudden death on Sunday, the Daily Mail has learned.The former Calvin Klein model was said to be ‘really thin,’ ‘gaunt’ and did not even sound like his normal self, according to a source close to his mother Crawford, 60, who added that Presley sometimes failed to make complete sense.Things were particularly bad in the last month of his life, before he checked into a rehab center in Santa Monica, California on Saturday and succumbed to a suspected overdose just hours later. Presley Gerber was ‘really thin,’ ‘gaunt’ and did not even sound like his normal self before he checked into rehab on Saturday. Source: presleygerber/Instagram ‘Presley was getting high before he went to rehab. That is why he went, because he could not kick the habit,’ the source said’Presley was getting high before he went to rehab. That’s why he went, because he could not kick the habit,’ our source said.’He looked terrible before he checked in, he was really thin and pale, his face was gaunt, and he was depressed in the weeks before his death, also jittery and didn’t make sense at times.’He looked like he was on meth, he had that meth look, but no one knew for sure what he was taking, how could anyone know? Drug addicts don’t usually serve up the truth.’He was far from the cover boy he used to be.’Presley had previously admitted to taking a plethora of drugs including Xanax, Valium, Oxycodone and ketamine, to name a few.’He had been in rehab many times and didn’t like it,’ said our source. ‘He was very vocal about saying rehab does not work. He even said on his show that rehab had a 98 percent failure rate, so he was not a fan.’Both Crawford and his father Rande, 64, were desperate for their son to get help, according to our source.’Both his parents made him go to rehab because they knew he was using,’ said the source. His parents Cindy Crawford and Rande Gerber were desperate for their son to get help, our source said (Presley pictured with his parents and his sister Kaia Gerber in May) One of the last photos of Presley saw him with a cap on backwards and barefoot in May’They were not going to give up on him, so they tried another rehab center, they had so much hope. He was in and out of rehab all the time, they spent a fortune to try to get him to fly right.’They continued: ‘They are helicopter parents, they are super involved, they did not drop the ball here. They pushed and pushed for him to get better. No one can blame them. They did their research and felt they were doing the right thing.’Though Crawford did not openly discuss Presley’s addiction battles, she frequently posted messages of encouragement on his Instagram videos, including calling him a ‘warrior’ back in March after he went public with the experimental ibogaine flood dose treatment he had undergone in Mexico to combat his substance abuse.But as he started to deteriorate this summer, it became apparent that what his parents had so viscerally feared could potentially become reality.’Their worst fear was that he would get a bad cocktail of drugs and die,’ said the source.’They worried about fentanyl and had many discussions about it. This absolutely was an issue for them, and they were fighting to keep him alive.’According to the County of Los Angeles Public Health, 70 percent of overdoses are caused by fentanyl. Presley’s cause of death has yet to be confirmed.’Everyone wants to know how he died in rehab, a place that was supposed to save him,’ our source said. ‘Presley may have snuck drugs in, no one knows at this point.’ Gerber checked into the Resolutions Living facility, a $7.7 million luxurious rehab in Santa Monica, California Insiders told the Daily Mail that his parents did all they could to help him have a fresh start. Source: presleygerber/InstagramAn insider close to the family told the Daily Mail earlier this week that they felt an untimely death had been ‘inevitable.’But questions will no doubt still be asked of the Resolutions Living facility – the $7.7 million rehabilitation home in Santa Monica where Presley had checked in before his death.His difficult past goes back over a decade to when he was a young teenager trying to fight depression and anxiety. He talked openly about how he struggled with the quick transition from a sporty high school student with a structured existence to a jet setting model.’He was very open about trying every medication out there to help him,’ our source said. ‘Nothing worked.”He had been on drugs on and off for years’ and was ‘often high,’ the source added.’He liked being high, he said it made him feel “normal.” His problem was much worse than he made it seem, he was in a bad way, but you can’t judge the guy, he was hurting.’The poor guy had so much anxiety and pain, he could not stop self-medicating, and he took a lot of different stuff.’ Presley was close to his younger sister Kaia, who fiercely supported his efforts to get sober. Source: cindycrawford/InstagramThe source also suggested there were bad influences in his life.’He had bad friends that did drugs too,’ they claimed. ‘How else do you think he got his hands on the drugs?’The source insisted that these ‘bad friends’ were not associated with his circle of celebrity pals which was made up of fellow nepo babies such as Brooklyn Beckham, Sofia Richie, Brandon Thomas Lee and Paris Hilton.’He had LA friends who were kind of strange, but who doesn’t?’ said the source. ‘You live in Hollywood Hills, you are going to get to know some weirdos.’An autopsy on Presley has already been completed, the Los Angeles County Medical Examiner confirmed, though his official cause of death has been deferred pending further testing. It could take months for toxicology and additional tests to confirm the truth.The Santa Monica Police Department is investigating the death as a suspected overdose, noting there is no indication of foul play.The Daily Mail has contacted a representative for Crawford and Resolutions Living for comment.