I guess this kind of Male Leads hates yandere the most and likes tsuntsun the best. It's a cliché. And sometimes I really hate that cliché, but this time I need to read more just to make sure if I should hate or not this ML, 'cause she poisoned people and that is not good, unless they are trash.
I swear, if I end up assuming that a good yandere disappeared from existence because of him, I will hate him, 'cause I like yanderes the most. (Not all yanderes, of course)