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"I don't think anyone could last with Spencer," Cheska told HELLO! Online, recalling Lucy and Spencer's very public break-up after series five.
Notorious heartbreaker Spencer admitted to cheating on his past two girlfriends from the show, Louise Thompson and Lucy Watson, with Lucy discovering that Spencer had cheated on her through Twitter.
In last week's episode, Spencer introduces his new love interest, former The Hills star Stephanie Pratt, onto the scene. In reality, the pair broke up in September.
The Made in Chelsea crew seemed to have warmed to the American beauty during her brief stay.
"I only got to know her just before she left, but we got on really well, she's really sweet," said Fran, with Cheska agreeing that Stephanie was a "really lovely, really nice girl".
Andy, meanwhile, split from Louise in the latest episode, and went on to talk about the challenge of having his love life played out on screen.
"Relationships are, at the same time, the best and worst thing about the show," said the small-screen star. "When they're great, they're really great because you get to spend a lot of time with the person that you're with, and you have so much fun with them.
"Then obviously when that goes wrong, it goes really wrong, so relationships are the best and worst thing."
"I like older women," added Andy, admitting that Jennifer Aniston and Thandie Newton were his celebrity crushes. "I've tried younger women and it can go a little bit wrong."
The trio agreed that the four new cast members, Belle, Tiffany, Freddie and Miffy, would provide more entertainment and drama this series.
"It's always scary coming onto the show," said Cheska. "We've all been through it at different points but I think we've all welcomed them. They're really lovely, fun, nice people."
"They're great," said Andy. "They're hilarious and they don't take anything too seriously, which is quite refreshing."