I think Bec has serious insecurities
Like big time
I think she boomerangs back to Gia because she sees her as the ‘popular girl’ and wants to be in with the ‘cool crowd’. So initially she tried to fit in and be one of the ‘popular girls’.
So Gia saying that Danny prefers her looks, is like a major insecurity trigger. Like the equivalent of your man fancying the hot/it girl at school.
It’s all very secondary school