Whether or not you ship Jarthur I find it beautifully refreshing how often they say they love each other.
I do interpret it more so platonically in a QPR sense, and at times even almost brotherly! The latter reasoning behind it is because they remind me of Finn and Jake and how often they say they love each other and others in the show (But romantic jarthur also has a place in my heart regardless!)
I'm pretty sure Harlan didn't want to explicitly say they were one thing or the other but one thing is for sure, and its that they have a bond like no other and to reduce it to a mere label would honestly reduce the journey they went through











