You could anonymously inform his job about how to acquire the same info that you acquired....or have a friend call.As far as him coming back,I'd cancel,or simply not answer when he came by.Try to be aware of doors being locked,and keep that phone nearby.Ugh what an awful thing for you to experience.I really like how you tried in every way to check yourself for where these feelings were coming from and whether they were rational.But,as you can see....sometimes we are leery....other times we are justified in it,and better safe than sorry you know?