"No way, bro, you actually plan on telling her that you like her? This evening? Do you think that she's going to say yes? Dude, come on, say something"
Max shook Arthur vigorously out of excitement after getting news from him, that he would be confessing his feelings to his neighbor, the one who caught him and Ellie together when he went over to their house today.
Arthur doesn't know anything about that yet, so please don't be the one to spill it.
He jumped on the bed with him and couldn't help, but express how happy he was for him over the news. He's wondering when it's going to happen because it's evening already and the skies are starting to get dark.