and they say that Callum is resistant?!
He's not resistant, he just hasn't been soaking in it for years. The most its likely done is made everyone in the valley a little more calm towards things like Callum and his insane libido.
I'm coming at things from the position of 'it's a porn game', so I'm not expecting to see sterling examples of altruism or children's-cartoon levels of moral explanation. The MC is just looking to paint things white. Callum hasn't done anything truly reprehensible in that pursuit, so I'm still here.
All I can really say at this point is, however far you made it last time, give the game another shot and go a little farther. I'll be honest, it's mainly because I really don't feel like playing all those bits of the game again to see what was said. I already made it through the slog once, dammit!
Carter's infidelity is towards the front of Douie's path, the circle explanation is later on Pixie's, and you need to do both Elphaba and Pixie for their confrontation.
Give some of the other paths a shot in the meantime, while you grind out the relationships. Hell, I wouldn't be surprised to find out that the 'blackmail' was really more of a 'mutually assured detention' sort of deal if you want to look at Mabel's route again.