Yep, pretty sure he knows he said something along those lines (e.g. Gia asked him if she’s his ‘usual type’ and he didn’t say no, but maybe smiled or joked, at v least).
Gia interpreted it as a yes because it wasn’t a hard no (and she expects that - Exhibit A: Scott’s ex photo). Dananconda’s telling porkies because he thinks he can get away with it. Because Gia’s discredited (his words) as a mean girl stirrer.
IMHO he’s proper messing with Bec’s head, making her feel (and act) unstable. First, the obliging honeymoon sex. Followed by total withdrawal, eyeing up another woman, saying there’s no sexual chemistry. Then, ‘trying’ by shagging her again. But still not giving her any real feels or reassurance, just jokes and ‘getting on’.
Bec knows he’s not into her. But her head’s a mess because he tells her he is, as well as shagging her.