«Εμπάθεια» comes from the words «εν» + «πάσχω», a verb that gives us the noun «πάθος» (passion).
«Εν» does not always mean “inside” literally; it is used often to describe the engagement in a situation. So, in this way, empathy means that someone is involved in a situation that has to do with this passion. That’s why we don’t speak about "εξωπάθεια" (sic), because something like that would mean that something happens out of us.
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.