Our expert says:
The only way to get a good estimate of whetwer someone has a specific Personality Disorder ( rather than just being a rather crummy sort of person in general ) is for them to see a good specialist shrink, a psychologist probably best, for a full-scale assessment and diagnosis.
CHANGE in personality is usually related to illness or similar problems - indeed, if there is just a conistent lifelong Personality Disorder, it can be very difficult to produce desirable change in it, even with full cooperation of the person and a skilled therapist.
Psychological Trauma can well cause PTSD, which can lead to increased irritability and aggression, as can Depression. And without treatment, these are usually or recuirent chronic conditions. I don't see why your behaviour would have caused what you describe - and as presumably your behaviour remained much the same during the period that His behaviour worsened and then improved, this would confirm your non-impact on that situation
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