I think to be fair, it is a genuine possibility he was. I know someone who has needed to have in-patient treatment for mental health issues twice. Each time, just beforehand, she became very agressive in her messages and text responses to our friendship group. After treatments, she's genuinely mortified at her own behaviour.
I'm not saying that to excuse him from the whole situation, just sharing that it's not always a 'let's claim mental distress to get out of trouble' situation.