I'm saying I don't believe the couple had a history of domestic violence. While Gabby was mad at Brian and hitting him, he wanted both of them to take a break from each other to cool off. They loved each other, traveling in national parks and it wasn't their first cross-country trip.
Domestic violence involves total control over the victim, with the aggressor refusing to walk away to take a break. Victims seek protection either at DV shelters or with family/friends. Gabby admitted to police that she was the instigator. Brian begged police not to arrest her because he loved Gabby, and he knew she loved him. I have no doubt he went to that nature area to commit suicide so they could be together in the afterlife. May they both RIP.
JMO