I feel so sad for Mick. So much to handle in his life, it's no wonder he has to invent coping techniques that don't involve other people. And that humour of his... It makes me laugh, then almost cry because of the hurt behind it.
I think you have to remember that Guy is only 24 and fresh out of his education. Of course, he's going to try and help the best way he can. Hopefully, he will realise Mick needs someone to just be there but give him space. Mick's like one of those wild horses. Any wrong move will spook him.