There's another thread about this, mentioning the fact that Stevi didn't seem to know anything about Chloe's guinea pig. And I said in there that she didn't seem to know much about his daughter either, cos he was talking about "my daughter" on Day 1 like he would to somebody he barely knew. That was my first real inkling that their relationship isn't real.
On a more general point, I think BB are mischievous in showing us the most nauseating and obviously 'fake' aspects of their relationship. They know that noone buys it and that's why we've had to endure endless "I love you, Chloe", "no, I love YOU Stevi". We're being trolled.