I disagree. Adolph's way of acting after Lewis passing is characteristic of someone in pain, not of some shallow love, if that was the case he would've just moved on with someone else. But Adolph did took Lewis for granted, thought he would always be there with him. Still, Adolph loved Lewis in his own way, even though he cheated, he always wanted to go back home, meaning Lewis.
So yeah, Adolph is a piece of sh**, but still always loved Lewis in his own crappy way