I agree. Would have been great if so, but I don't believe BL went back to SLC in a healthier state, probably the opposite. I am very much on the side of "He needed a break from Gabby" and may actually have tried to self-extricate from an increasingly serious situation. He was decompensating after the LE stop in Moab, they probably couldn't stop thinking about it or talking about it. Now, one of their fairly common behaviors (spatting and getting handsy with each other) was publicly known and documented. Welcome to Utah. There's a joke that anyone from out of state who goes to Utah will be stopped by at least one LEO, for some reason, somewhere. That's when they realized "We're not in FL any more." There's no public carry of weapons in Utah, no fighting in public in Utah, no sales of liquor on Sundays in most places, and in fact, one has to register to buy alcohol, IIRC. I'm not saying that Gabby or BL wanted alcohol, I'm just saying that Utah is prim and proper, and very no-nonsense, but community oriented, about policing. It's a place where you may still get off with a warning if you're only going 10 mph over speed limit.
I think BL was freaked out by his close encounter and probably pretty angry with Gabby (who admits she slapped him first and he thinks stiff-arming her/smooshing her face is a self-defense move - apparently, so does LE).
Anyway, they go ahead and see Arches (does Gabby ever upload any pictures from that amazing place? Should have been several, it provides the photo ops of a lifetime, although perhaps the sheen was off the trip at that point). I figure they planned to stay about 3 days there and apparently go through that without incident. But the Van Life honeymoon was over. At some point, BL decides to go back to FL, Gabby tells her parents he's going for a short trip, so in theory, he had a round trip ticket. This is called a "refueling" event when a child (yes, even an adult child) goes for contact with parents when they're feeling negative feelings/depressed/out of control. It indicates an immature personality, to me. I would love to get an assessment on BL's actual mental age, but of course, we'll never know that now.
I doubt opiates or any scheduled Rx would be involved in any way. Makes no sense. And common anxiety meds could be called in by his regular doctor (assuming he had one) even to Utah.
I think he may have gone home, to reflect on whether he wanted to return. From the 17-19th, Gabby is coping by working on her Nomadic Statik upload. At any rate, as had happened so many times before (according to Gabby's friend), they made up and continued. But BL is very much on edge. I believe he remains unmedicated, that his level of agitation is gradually reach new heights. It has gone beyond anxiety and is now in possession of most of his thought processes. Gabby still thinks things can go back to normal, but BL's greatest fear is being put in jail/outed as a "bad person," and not getting to live his life in nature. I just read yesterday in some article that it was Brian who wanted the Van Life, and Gabby liked to say "Gabby Petito does not go outdoors." So she was modifying a major thing about herself in this new Van Life, and probably experiencing it as a period of growth in her life.
Meanwhile, only BL knows just how close he came to totally losing it with her; how much closer he's getting each time they fight; how without the watchful eyes of Mom and Dad, he can't quite keep himself together. He has written lifestyle "checks" that his brain can't cash. Young people constantly think they can do things that end up being completely over their head. I know I did. Travel is tough and it is a good pre-marriage exercise in compatibility. Many relationships disintegrate during travel.
I believe BL "lost it" at Spread Creek, for some probably petty reason.