Also

I think all his monologue about his dad watching him was in his head like wasnt sure sure until the very last panels where he said "it crossed me mind for a parent and kid to go hiking, isnt it bc father wanted to die, so isnt it fine?" = its implied the father wanted to have sex with his son and later suicide but he didnt because he never got to fuck his son, so that realization made him sure he wasn't just fantasizing. And than he lied about sleeping with a man asking his dad if its okay to open the door, like an invitation. Fucking hell I've wrote so much about father son fucking eo im finna going to hell.