I've been away from all the news for ages, so Nick and Aaron have had some bust up in public?
Aaron and his girlfriend got arrested for DUI and possession of pot. Nick tweeted something to the effect of "To my brother, I love you no matter what, and if you want help, I'm here for you," and then Aaron tweeted this long rant of a "statement" about how he didn't do anything wrong, he has a prescription of medicinal marijuana, etc. etc. and then went after Nick for publicly tweeting instead of calling him. Then Lauren tweeted Aaron to have his girlfriend message her his new number since he apparently changed it (which, if that's true, would explain why Nick couldn't have just called him).
From what Aaron has tweeted and said to the media, it sounds like he's in complete denial that he even has a problem. Nothing is ever his fault, and everyone else is out to get him because of his "celebrity status." The cops target him unfairly, people bully him and body shame him, etc. etc. He is always the victim. No one is going to be able to help him until he decides he needs help.