I’m not so sure.
He could have told his parents that she hooked-up with another guy and told him to get lost.
We need to stop acting as if, according to our own lights, we know what actually went on.
There’s just too many negative triggers for this family: he comes home with her car, they won’t answer the desperate texts from her family. They acted in a completely inappropriate manner. That’s my opinion......may be wrong, but with what we’ve been given I can only see them as some very shady people.