i think Caliborn acting that way is still kinda justified by the fact that he's still the evil half, so of course Calliope would actually be more interested in romance and "good" because she has the potential for it whereas Caliborn does not, it'd literally be going against his biology. I think the definition for "good" and "evil" in Cherubs could vary if they were influenced by other species but take into account that whatever happens is still justified by the inherent divide in the species

I mean, no yeah it does fit thematically for their duality, so it could just be the good/evil duality thing, I still don’t like kinda lessening his choice on the matter because of the good/evil divide though. Guy revels in his assholery.