"Grant is a good actor really," he said to the Daily Mail Australia.
"Everyone thought he was really dumb."
"I really thought he was genuine, at one point in the house, he gave me this look, after a week, two days before I left, just this weird look that was really suspicious."
He continued, "It was like he was planning something or he had some hidden agenda, so I saw him being a bit suspicious - and that's when the whole Tayla and Grant saga happened."
Charlie spoke to WHO after he was eliminated from the show.
"It was a short time! I think I was honest and lived up to my values. I didn’t pretend to be someone I wasn’t. I was genuinely there to find a connection. And I’d definitely do it again."