Relationship with a borderline personality disorder

In a relationship they are very difficult to deal with because of the instability – they go from an apparent true love to true hate in a glance. And from victim to abuser. Most of the times the self-destruction makes the partner really guilty to leave, or the parent too scared to solve the situation. There is also a big fear of being abandoned, being in very intense but not necessarily good relationships, getting mad if frustrated in any way, but remaining really dependent of the partner, using all kinds of ways to prevent him/her to leave, even by hurting themselves which makes it very difficult.