This is very strange. It’s odd, because they looked young and happy. But of course you never know, and his behavior is certainly not encouraging.
It could also be that she dumped him and took off on her own and he’s pizzed so just went home and now doesn’t want to get blamed if she does something stupid and gets dead. Its possible he doesn’t know where she is. Or maybe she took off with some other guy.
Or maybe she dumped him and he killed her. 😐