as the brain is a social organ and hardwired to stay connected, it’s not necessarily prone to letting go easily of a primary attachment. In the brain’s world, better to have a negative bond than the existential death of no bond at all. And so, even if you know deep down inside that leaving is the right thing to do, even if you have five times as many bad days together as good ones, even if the lies between you are making you physically sick, the brain still doesn’t want to let the relationship go.
