As others have stated it is important to always look at each situation independently. There are so many co morbid aspects to all disorders that behaviors are often mis interpreted.

Impulsivity is one of the criteria for the diagnosis of BPD and again it can be demonstrated in a variety of forms. In many cases a new temporary object can enter the picture as part of the push pull process that is common in the disorder. Sometimes it can also be part of the "I don't deserve you" thinking when fear of abandonment becomes overwhelming.

If you are committed to this relationship it is critical that you both seek professional help.

BPD can be mitigated and eventually put into long term recovery but the need for willingness is paramount...

Take care of you first...like on the airplane...give yourself the oxygen and then pass it on..

Lenny.