You can also include yourself in your own recovery. While being a supportive friend is well intended, the contact might also impede your own ability to emotionally recover and so if you feel it is at some time, you can pull back on the amount of contact. For many people in relationships (of different kinds- not only romantic), we tend to over function in the helping and caring situations, sometimes to the extent where we put our own needs on the back burner. This may or may not be you, but if it is, consider you can focus on your own recovery.
I agree that your (former) partner has shown insight by focusing on hers, and you also can focus on yours too. Many people who have been in or are in a relationship with someone with BPD also benefit from therapy too.
Sometimes we can not see our own tendencies. Our family of origin shapes our experience of "normal" for us as children. It's the only "normal" children know as they grow up. A therapist/counselor can be an objective person to assess this.
Self care is important and so I encourage you to also focus on your needs and interests- hobbies friends, work and consider counseling if you feel you have been over functioning as a helper.


