Honestly this is really confusing here. It's like some mystery movie where things are so confusing, nobody knows who's who.. gosh... Honestly, since this boy is only 18, I would think that it's better to just pay his parents a visit.. like a chat and tell his parents what happened. For police to take action, or to even sue him will take few years.. well if you have the time, by all means go ahead! I support!