Just watched this. My takeaway is that Simon was your typical grandiose and charismatic sociopath who, once he snared Brittany, had the means to indulge his worst impulses - food, drugs, wild spending and living out his delusional fantasies via Brittany's position in Hollywood. But the drugs, the food, and his own mental illness overwhelmed him - got the best of him - and the three of them were living in a beautiful madhouse. (folie a trois) The attention to housekeeping, nutrition, and health are the first to go in those dysfunctional situations.
I believe he dangled a romantic relation