What if they broke up, he flew home and moved his own stuff out of storage back into the house because he was no longer going to be on the trip. When GP spoke to her dad in the hotel, she didn't tell him BL left because it wasn't a planned trip back but rather he just left in a huff and she didn't want her parents to know she was alone.
Then GP and BL cool off and make up and he decides to join her again on the trip and flies back.
JMO but that seems more likely than a planned trip to empty out a storage locker that could have been done before they left?
JMHO, but I think the trip back was to move their stuff OUT of storage and back into the home of BL's parents, because this would save GP and BL maybe $200-300 a month which would help with their trip finances.