In all seriousness, his claims that this absence wasn't drug-affected is a bunch of crap. The man takes sleeping pills every day. He's addicted to Ambien. He used the drug to sleep away the days. No one should be taking sleeping pills every day, certainly not a recovering opiate abuser.
His alleged girlfriend sounds more like an enabler. What did she do to respond to his so-called depressive state? Who did she call for help?
Anyone who claims to be his friend should think about staging an intervention. A in-patient medical detox should be considered. Whatever his unspoken medical condition is, it should not be used to mask his psychological and pharmacological issues. The man needs treatment and ongoing professional help.
Oh, and someone should take all his guns away until he is cleared by a psychiatrist.