From memory, Gia said to Brook at the dinner table the words Danny said (of himself and Bec as a couple) "I'm good, but outside of the experiment you'd be my type". Danny has been single for 4 years - the clever thing to say would have been what he sees as "his type" doesn't actually work for him. I still don't think he said it.
And as for giving Bec reassurances - Danny has known her 3 (now 4) weeks; the honeymoon she threw a rage at him, suspecting him of looking at another woman. The insistence from Bec at the dinner party that he back her up, that he sit next to her to show a united front, "you have to sit next to me" etc, to the point he said (off camera) "Stop telling me what to do". I don't think there's a bloke out there able to give Bec the support she requires. I watched a bit of the after dinner party show of Bec and her apologies, turned off in disgust at Bec insisting that "it wasn't her / she's a kind person". Nah, it literally was you, pissed and nasty.