Well in a late report the grugde was real in later japan after a husband went pshyco and killed the wife, chil, and cat. In my case she is real but that is me so IDK. It was reported she was real after the house was cursed by her spirit. In that case she is very real but most likely to haunt Japan because the house is located there. I hope i answered your question.
Try and talk things out - get everything that needs to be talked about out on the table so you can get by this. Either way whether you end up friends or not after this at least everything that needed to be said has been said and set straight.
The Grudge is a movie. Movies do not kill people.There is no character in The Grudge movies that is named, "The Grudge," so this question does not make sense.Perhaps you meant to ask, why do the ghosts in The Grudgemovies kill people? If so, then see the Related Question below.