So my recent fic is getting a few mixed reviews so here's an explanation that'll hopefully help: This isn't an entirely healthy relationship! Most ABO relationships aren't healthy unfortunately, but this one isn't entirely healthy per se. As for the Bill's silence thing: It caught him off guard, honestly. Dipper and Bill don't talk all that much, as mentioned by Dipper's lack of knowing a lot about his alpha. So it surprised him when he realized how Dipper found out, much less kept it from him all this time. And to add to the Pacifica thing, as an alpha he missed contact. Alphas are dominate creatures that need contact with omegas. But Bill didn't actually let it get farther than the first kiss on him because he realized quickly what was going on (hence why Mabel trusted him in the first place). So this being written from Dipper's point of view mostly, you're seeing Bill being quiet and suspicious, when in actuality he's just shocked that Dipper finally said what was on his mind. To add to it, Dipper's jealousy and rage fuzzed out the actuality that Bill quickly flipped out when realizing what Pacifica was doing while he was waiting for Mabel to come get her. As with the sex make-up thing, Dipper isn't going to be won that easily, but again, as an omega who has been lacking the contact from his alpha, desperation shows in the way of anger and in this case, lust. But again, while this isn't entirely unhealthy, it's also not entirely abusive. It's meant to be realistic in the ABO dynamics. I hope this helps!