Fish story.

I've only one fish in my aquarium from past four month, it's been all alone in this mid sized aquarium.When i had bought there were totally nine fishes,All died.This one continues to live all alone,Despite of being alone and not treated the same as it used to be treated before when the aquarium was with other fishes.I've not cleaned filter from long time.Some days i even forget to feed -I don't even turn on the aquarium cleaning machine and still continues to live -Like real fighter and keeps looking outside the aquarium.

I look at it sometime and feel how helpless this fish is,Can it commit suicide ?or it loves it's life so much that it continues to live.is it the tom hanks of castaway >? I go close to aquarium and say Hi to it and it just run away from this side of the aquarium to other side,Does it hate me  ? or is it scared of me?