Even the director struggles to give a definite answer.
What I take from the film is, his disappointment with life comes to head. He should be excited about a new job, but it's not what he really wanted. And to add to that he's being treated badly and doesn't really fit in.
He's homesick for a while, but then slowly realises his home life isn't exactly the be and end all, the letters from his Mum just reinforce his disappointment with life. And working on a horror film for virtually every waking hour isn't gonna help matters!
Not claiming this as fact, just what I take from the film.
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