[US] Romance scam or relationship with rich woman

Hi, My friend met a girl on the dating app Boo. She lives in Switzerland, looks like a model, studied medicine, drives a Porsche, and claims her father is a prosecutor in US. She was supposed to come visit him, but after arriving in US, she suddenly said she had cancer. Later, she said she was cured and came to see him again — but no one saw her, so we’re starting to think he might have made it up.

She constantly brags about her lifestyle — says her dad drives a G-Wagon and that she speaks five languages. She doesn’t have any social media, only communicates via WhatsApp. She’s never asked for money, and this has been going on for months. The whole story sounds off, and as his friends, we’re seriously starting to think this might be some kind of elaborate scam or catfish

He isn’t educated and doesn’t have money. So if this is a scam, what’s the point? They’ve been in this ‘relationship’ for months, and he hasn’t lost any money — but the whole thing still seems really strange