As the question asks, why can Walt just not do without Jesse in Breaking Bad? At the beginning, he needed him to get into the business and stuff but later, Jesse only proved to be nothing but trouble. Despite without having any significant benefits but rather much trouble, logically Walt should have separated paths with him long time ago. So why does he not do this?
Addendum: Actually I read that initially it was planned that Jesse was supposed to die around the end of Season 1 but due to extraordinary acting of Aaron Paul, they decided not to. So how is this decision rationalized in the story?