grammar - Are we not allowed to use reflexive pronouns to refer to their fellow objects?

I would like to know whether the following sentence is ambiguous or not in a way that "himself" could either refer to "the man" or "the boy":

"The man told the boy different things about himself."

I'm thinking that I should use "him" to refer to "the boy" and that "himself" could only refer to "the man" since I've read that reflexive pronouns could only refer to their antecedent subjects, but I'm not quite sure about this.

Thanks in advance!