Young couple goes on van tour of US, boy comes back with van - no girl

O.k. I get it. You will never change your mind about Brian, understood. I'm not emotionally involved in the story, so I'm just chatting.

I will put this idea with you, since I think it's possible. Let's just say, hypothetically that Brian was a little immature with some minor mental disorders, but otherwise about average in most other ways. He really loves Gabby and has some crazy emotions for her, but she keeps hitting him, and nagging non-stop for one to many days?!?! (More theories) Brian's emotion finally gets the best of him, and screams, SHUT THE Fork* UP, grabs her by the throat, and keeps yelling stop acting CRAZY YOU STUPID F----- B-----! By the time he comes back to his senses, Gabby isn't breathing, and he panics. The rest is history.

Let's say, this is what happens for discussion purposes, does this change anything?
I'm not emotionally invested either (which is why I would never have camped out on the street in front of the house) other than caring about all young women's vulnerabilities. I know the outcome of Gabby's fate and who her belongings ended up with, not much there to allow me to change my mind about Brian.

Okay, you want me to turn to Gabby. Well, likewise, I don't think Gabby was emotionally mature either. Not in an arrested development way but in a non-worldly, limited life experience kind of way. I don't think her acting out in a physical way towards him was violent, I think it was her only known method of "conflict resolution" as a child might do. His comprehension of that meant she was "crazy" or "OCD". Your scenario is exactly what I envision having happened. And it doesn't change anything.