well personally I wouldnt care if they hurt others (not ppl close to me tho) as long as they dont get caught and arent a sadist and do it quickly.
although when I see signs of them just using me, manipulating me and seeing me as replacable, I instantly gtfo.
stalking is fine, as long as I have at least a bit of privacy and alone time sometimes.
hurting me intentionally is also a no go and hurting me badly unintentionally is also a no go, supressing urges and trying to communicate is the most important part in having actual relationships like this, if my yandere would hurt me just because of a small misunderstanding then that would be bad but if its fixable with a honest talk then thats still acceptable.
always remember to communicate