Sounds like you’re sexualizing on an asexual behavior. Think of how nudists live. They don’t become aroused just at the sight of a person, the context must be sexual. We’ve normalized that the hot body is inherently sexual, not everyone does that. You’ve normalized that physical affection is inherently sexual, your girlfriend doesn’t.
You leave. That’s it – leave.
If he threatened self-half, report it to the police. And that’s it.
Don’t follow up to see if he is OK. You aren’t involved anymore.
If he keeps bothering you, block him.
Sounds like you’re sexualizing on an asexual behavior. Think of how nudists live. They don’t become aroused just at the sight of a person, the context must be sexual. We’ve normalized that the hot body is inherently sexual, not everyone does that. You’ve normalized that physical affection is inherently sexual, your girlfriend doesn’t.