With my very limited knowledge of what was actually going on, my theory is that Brian went to Florida to take a break. It had only been 5 days since the police incident--he more than likely made the flight reservations a few days before hand, so the plans seem to have been made right after that fight on the 12th. He may have used moving things out of the storage as an excuse, but may actually have moved whatever Gabby had left in the house over to storage with the intent that she would not be returning due to a break in their relationship. (There was a post earlier that LE had stated that nothing of Gabby's was in the house when they went there.) I would guess that when he returned, there was no intention of keeping the relationship in tact, and they continued fighting.
That is entirely possible but we have no information. Gabby’s family was well aware of this trip and whatever reason was given to them. It was mentioned by them. Yet they didn’t seem aware there were problems until they did not hear from her for nearly 2 weeks. I thought maybe lease was up for storage unit and several things needed to be done and it was preplanned he’d go back in the middle of his trip to take care of some things. So cheap tickets and hotel cost as it was when done well in advance. But no evidence of that either