A girl who lost their best guy friend to another girl and now constantly calls and asks her "past best guy friend" questions all of the time about the other girl and him because she is so obsessive and has been replaced.
Now that SHE has been replaced by ME she is calling him all of the time and asking him if we have spooned and then doesn't even believe him, and comes and asks me....who does that?!?!
is the one who follows another one or "thing"
could be animal or human to achieve something that always wanted and for personal interest also that thing
could be
killing
stealing
kidnapping...etc
the most sensible examples of this are
Predatore "movie"
and the game "s.t.a.l.k.e.r"