Stockholm Syndrome in a relationship really refers to constantly expecting the person that hurt you to make things better. It's like we need validation from them, without that, we keep questioning ourselve. We will take the littlest crumbs that are offered waiting for a big payoff that never comes.
Stockholm Syndrome was from the bank robbery in Stockholm. They were given little bits of hope, along with being held captive. They grabbed onto the hope, and possibly love. When released, they would not testify against the bank robbers that held them hostage. They wanted to save them.