Nemesis

A loaded gun is the only solution when you have tried everything else and failed. More so, when the other person is beyond the reaches of reason or pleading. But, can you hate someone so much, who’s been with you so long? You can - if everything you ever had, was lost because of him. “Why don't you just leave me alone?” he would often cry. The reply, as always before, was a loud, mocking laugh.
The hatred inside him had reached a feverish pitch.
“It is all his mistake”, he kept mumbling.
For one to live, other must die.
Fate has brought them the chance.
They stood face to face.
Gun on the temple.
Their eyes met.
In mirror.
Bang!

PS: There is a pattern. Hint: Number of words.