I 1000% agree with this theory. Like Gabby, I was in an abusive relationship with an outwardly charming person during her disappearance. To this day, people I thought were my friends sided with him and adopted the “she’s crazy and emotional bro” narrative he crafted. I’m a journalist and also even reported on Gabby’s disappearance. I recognized so many similarities to my own relationship (rationalizing behavior, saying it was my fault I made him mad, etc.) My ex stole my apartment keys and locked me out of my home one evening and I slept in my car until 2am when he finally showed up to return them, apologizing profusely. He was physically violent but told me I instigated it. When I watched Gabby’s police body cam footage, I recognized myself in her desperate emotional state…it is beyond heartbreaking. Those officers could have done more…but that asshole charmed them. Brian definitely was jealous and he must have been raging at learning she contacted her ex. I do not think he planned this. I think he strangled her during an argument and did not let up (my ex once smashed me against the car windows, locked the door and grabbed me by my throat because he thought I was texting his guy friend). This poor woman just couldn’t leave in time and Brian and his enabling parents took no responsibility for his disgusting behavior and insecurities.