Does school days anime have the sickest ending ever?(read disc)?

[AnindyaGuin]

I could not sleep for two days.when my girlfriend asked me the reason i showed her the ending and told her the story.she was stunned at first but then told me that the reason that girl killed him was not cause he cheated her but cause he did not choose her and she snapped.she thanked the creaters cause she thinks i will now think twice to cheat on her well she maybe right or wrong.tell me what you think.