Arg, 26, said that 28-year-old Mark didn't want him at his and Michelle Keegan's nuptials - unless he sorted himself out.
But, after he spent Christmas in rehab, Arg said Mark reconsidered.
Speaking to Now magazine, Arg said: "Mark told me I wasn't invited to his wedding if I didn't change.
"But when I went into rehab, he got in touch because he was so proud of me."
Arg is even allowed to go to the stag do now. Phew, we couldn't have that TOWIE bromance crumbling, could we?
After getting into a string of trouble last year, Arg was suspended from the Essex reality show. But he's hoping bosses will be as forgiving as Mark.
He said: "I'd love to go back. I miss it. It's the best thing I've ever done in my life and I'm sorry I blew it.
"But I want to prove I'm worthy, I'm working on that."
The rest of The Only Way Is Essex gang are currently in Tenerife filming for the new series.
Let's hope the producers give Arg the go ahead to catch a late flight out there and join them!