It is not unexpected to receive so much hate when your game features killing a woman. I personally find this to be a primitive response since that same hater loves all the other games where you kill, murder, torture men... (they just call them terrorists or bad guys and it's OK then)
In fact if you just change the concept you might avoid all negative responses. Change it from: Your girlfriend is cheating on you. to: You are a woman. Your best female friend got your boyfriend drunk and slept with him.
The whole point of games, movies, art is that it is NOT REAL. The kind of people that hurt others in real life are not the same people that make or play violent games. If they were, everyone here would be in jail...
On to the game, The art isn't the best and the options are limited. There is no story other than the Author comments. Could have easily been improved with just a little more work. How hard is it to write a few paragraphs introduction or a visual cut scene. Also, the victim doesn't retain any damage and you can't control how many hits or shots you take...
I have no problem with the content, but not enough effort was put into this game.