The singer was mentored by Gary on the ninth series of X Factor, where he finished in third place behind winner James Arthur and runner-up Jahmene Douglas.
"I'm still in contact with Gary after all these years. If I need anything I'll text him. He got me tickets to the last Take That tour," said Christopher.
"I haven't spoken to Louis [Walsh]," he added.
"It's a competition – they wanted their acts to win. Regardless of whatever tactics they used, I've still done well. The general public have seen through that I think – they're not thick. They obviously didn't think half of it was true anyway or they wouldn't have kept voting for me for all that time. They had a lot of faith in me and I've got a lot of faith in them."
CBB airs nightly on Channel 5.