Thomas and Luis were a little worse for wear as they left the office and gave Andrew and Maxwell a moment to gather themselves as well. Both parents made it very clear to Andrew that Maxwell was their priority, and it was clear that Maxwell was having his worldview turned on its head.
Maxwell, up until this point, had thought that his parents 'liked' him. More that they tolerated him than anything else, and probably saw him as an asset that could be exchanged for something better. Very business oriented.
Andrew knew that was wrong, but he had the feeling that Maxwell wouldn't have listened to him if he had said it. Now, finally being confronted with the absolute horror on his parents face as he admitted some of his feelings, Maxwell was coming to terms with the fact that wasn't the case.
Add to the fact that Maxwell had spoken about something that was trauma for him, he was doing the best that he could now that his parents had left.