Suzanne had said the last few days had been magical.
That tells me Barry was largely absent.
Barry did know she was having an affair. But he didn't know with whom. Until IMO Friday when he'd somehow ascertained it was a Jeff....I think he heard Suzanne say Jeff's name, courtesy of some kind of surveillance, including direct surveillance, stalking Suzanne in her own home. Up from down by the river (down from up by the river?) while Suzanne thought she was alone-alone.
Perhaps Barry sent the girls away and set a trap for Suzanne's lover, believing the lover would show up. But two things happened-- one, Suzanne discovered something on Wednesday which inspired the "I'm done" and two, Barry discovered that Jeff wasn't local, wouldn't be showing up and that Suzanne wasn't being lusted after by a rogue boy (who could blame such a guy, Barry would think, after all men only want one thing -- and Suzanne was the most beautiful woman right up to the countyline) -- and that Suzanne herself was pursuing another man.
Up until that moment/realization IMO, Barry thought there was competition for his wife. And Barry knew himself to be bigger, badder, stronger, more push-upped, more godly and better endowed as an everytime lover to lose to a lesser man.
Knowing what we know, if Barry had caught a man sunbathing in his backyard with Suzanne, hunter Barry would have rescued his wife and permanently disappeared the competition. Never an idle threat IMO.
Those who try to normalize Barry's behaviors are maybe fortunate never to have known the likes of a Barry. I believe him to be someone who believes the entire world is there essentially to serve him. Love isn't about care, companionship, respect, etc. It's a veneer. It's possession, dominance, codependency (forced dependence) --
The AA is rife with Barry's world view. Suzanne being strong, thinking for herself, reclaiming and exercising her free agency -- he called that ballsy, blamed illness and IPAs and druglord Tim for getting Suzanne not in her right mind! He did not think Suzanne should think for herself!!
If he could just un-ballsy her, go back to how it was when she wasn't thinking freely for herself, all would be fine.
Imagine confronting a spouse with your documented issues within the relationship, with your desire first to improve then to exit your marriage, with well-reasoned points, and have that partner tell you that you aren't thinking straight and dismiss any further dialogue on the topic! Demeaning, to say the last.
Barry wasn't going to let Suzanne go.
If that meant eliminating every last threat to that, I think he was that committed...
If JL had come to Colorado, he's who we'd be looking for.