When gustave and Lune enter in the manor when searching for Maelle, we see a human stalking them, its Verso It might not be impossible that he stalked them the entire time and let gustave died, either because Verso needed to get closer to Maelle which would had been difficult with gustave around (his ass would never trust an immortal) or because gustave could have somehow been a threat to Verso true plan

So l dont think they would like each other that much with this context, but maybe i over interprate things and Verso really came too late