I though he did have rehab of sorts as he mentioned recently he went away for help for a bit. I bet all this type of help is all arranged by his management, label etc. It's probably all on his contract that all is to be controlled by management and that really is where the problem lies it should be something private and pwrsonal away from work which is largely a problem when work is where the issues likely spring from.
I realised he came from The X Factor and that is already alarm bells as previous contestants have said a lot about that show and how the contracts are and I wonder if he is still in that sort of contract. It must be horrible to not to be free to be you and be under control if that's the case.
Money, fame, adoration, freebies, fans is not worth sacrificing your freedom and wellbeing for.