User blog comment:ThatGuy456/A Guy's Thoughts: (Week 4) "New Amazing World of Gumball in February!"/@comment-28146494-20170305000201/@comment-28485972-20170305002411

He didn't care about Claire either. But once he found out that he's not involved in her life, he wanted to get involved. I don't think he cares much about Rob (although he did help him find himself in The Nemesis), but he was aware that he was his nemesis (therefore, he was involved in his life), but when he "dumped him", he simply wanted to make things back the way they were before. I know it may seem weird that Gumball now calls him his actual name, but I think that has more to do with the fact that the crew doesn't want to repeat the same joke too often.