The reality star told OK! magazine that she believes the pair - who met on this year's 'I'm A Celebrity' - are trying to keep themselves in the press since leaving the jungle.
"I don’t think that’s far from the truth," she said.
"If they had such a strong connection, why didn’t something happen in the jungle? When you really connect with someone, you can’t fight it."
"I think they’re both trying to keep the hype from the jungle going.
"I don’t believe it. Amy said in an interview last week that she sees him as a ‘little brother’ but then he said they had ‘sexual chemistry’.
"Can you have sexual chemistry with a big sister? I don’t understand that one!
And Sam says that, despite admitting she still loves Mr Essex, watching his romance with Amy hasn't upset her as much as she thought it would.
"Surprisingly, it doesn’t hurt as much as I thought it would," she said. "I’m sad and disappointed that it’s all been done so publicly but I’m not heartbroken.
"I’ve got so used to seeing their pictures everywhere that I don’t really feel anything."
Read the full interview in OK Magazine, out now www.ok.co.uk