Poor Gabby, trying so hard to please and not upset Brian, she had no idea that that was an unwinnable role. She would never be able to regulate his unregulated emotions. She was a chokehold away from death the minute she met him.
I wouldn't be surprised to learn that he killed her in the van or just outside it, if she tried to get away. He may have seen her text history, she may have told him she wanted to continue on her own, The Most Dangerous Time in a volatile relationships. And he didn't want to hear it. So he "calmed her down" cutting off her vocal cords and her oxygen and then her life.
And had his parents turned him over to LE or tipped him in themselves, he'd likely still be alive, facing charges or by now convicted, but alive.
I can (marginally) respect parents who stand by their adult children through trials; I can't respect one's who shield their adult children from the consequences of their actions.
And Gabby had such solid male role models who loved her, even an ex boyfriend who would have done anything to protect her, if only she wasn't hundreds of miles away from safety when Brian took advantage of isolation and stole Gabby's opportunity to break free of him, with his bare hands.
That Moab stop is so painful to watch, Gabby was terrified (maybe for a mess of reasons) about what would happen if Brian was arrested, which IMO is why she minimized his actions and overestimated hers. Brian's demeanor, chilling to me. Acting like he was trying to deescalate the tension when he was the instigator and aggressor. Taking her keys, her phone, her van. Abject abuse, and a master manipulator to get Gabby to feel responsible for it. Not respecting any of her boundaries, playing on her fears, belittling her dreams.
Saddens me, angers me that the last thing she saw before the light went out of her eyes was the real Brian. Dangerous coward.
Killed her so she couldn't leave him.
And that story is as old as dirt.
JMO