Mario, who joined the TOWIE cast in 2011, did not appear in series 12 of the ITV2 reality show due to "personal issues".
Last night, TOWIE fans watched the latest series come to an end with a Grease-themed finale episode, and Mario felt sad that he was unable to join in the fun.
He tweeted: "Gutted I couldn't be a part of this series but congratulations to the rest if the cast on completing series 12 x."
Speaking about Mario's absence from the show, a TOWIE spokesperson tells Reveal: "It was mutually agreed ahead of Marbella that Mario would take some time out from TOWIE to address some personal issues.
"We didn't set a time limit on how long he would be out of the show and will address his return later in the year ahead of next series."
In early June, Mario did not accompany his TOWIE cast mates to Marbella after The Sun claimed to have footage of him snorting white powder on a night out.
At the time, a rep for the show confirmed they were launching an investigation into the allegations. Since then, no charges have been brought against Mario.