Zsadist is a creature of extreme's. His emotions are stronger than most. He's proven this द्वारा how deeply he hate's and how strongly he love's. His प्यार for Bella is so all consuming, that if she where to pass away because of something that he would automatically blame himself for (her falling pregnant), he'd be लॉस्ट forever. The good side of Z would disappear and he would either just become a killing machine, और so than how he was after the sadistic evil mistress, या he'd end up going insane with grief and ask Phury to kill him (so he could go into the fade and be with Bella once more).
he probably would have became INSANE!!!!! he would have dematerilized w/ Bella in his arms and went far...far...away. And if i woulda read that, i would totally break down CRYING!!!!!!!!!!!!!!!!!!!