Soldato
It sounds more like he believed his girlfriend about the 17 year old, paid him off (which was apparently half his net worth), found out she was a liar and then offed himself upon realising this could ruin him. She's a despicable woman.
You could be right. I read his friends were worried that he was completely infatuated with her, so I think his judgement was well and truly skewed. The way she said she hadn't slept with the boy, and that it was Bourdains idea to pay him off, proves she is a complete ****.