The 32-year-old television personality is also said to be struggling to cope without his ex-partner Kourtney Kardashian, with whom he has Mason, six, Penelope, three and Reign, 14 months.
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Another insider added to E! News: "Scott has been going out every night and drinking again. He has been partying hard. After a few months of being on his best behavior, he cracked.
"Scott is so used to Kourtney taking him back every time, but this time has been different. Scott is already falling back into his old partying habits. Kourtney is not impressed."
- Bang! Showbiz