SPOILER ALERT - at what point did Michelle...

... decide to not only stop indulging in her perpetrator's games and in any way to take care of him and play a sado-masochistic relationship with him but also...

SPOILER - at the end, to finally ELIMINATE him, via, in that instance, SPOILER, her son?

Basically, when did she finally decide she wants him dead? And what exactly made her "officialize" (if that is even a word, as in, to make it 'official') her decision to the point that she is happy that he will be gone? Not just reported to the police? (As difficult as it could be.) Not just get away with it. Not continue to stalk and attack her etc. But that its finally the time for him to die?

In an nutshell, for her personally, when did he exactly CROSS the line, for, as undeniably wrong as he was even in the first attack, she doesn't want him dead even when he sadly does it to her a few more times, so what made her finally decide it at the end? Did she ultimately believe that he would not stop and is likely to make the situation worse? And when did she give up her perhaps damaged "S&M-type of attraction", if it even was that, to him, and decide its time for him to leave this planet? Cheers.