You should never try to mess with love becuase if you have ever heard the saying "love is a powerful thing" then you know that if you mess with it your spells will definitely backfire.
i wouldnt do it if I was you. I wouldnt mess with love.
and "black" magic or whatever u wanna classify it in isnt wrong, the human race is cruel and good. depends on how u use it, from wht this person is saying, it is wrong