My past relationship was by far the most traumatizing experience I have ever dealth with in my otherwise very normal, stable life. My ex was never officially diagnosed with BPD (as far as I know), but she displayed all the symptoms. For a long time after breaking up I thought she was just an evil person, but now after learning about this disorder I just think she's sick.

I am not interested in rekindling the relationship. I could never trust her again, but it's sort of like a tiger at the zoo. I know the tiger could and probably would eat me the first chance it got, but I don't hate the tiger - that's just the way it is. 

We stay in touch once in a while over e-mail, but she says things that are clearly lies and makes commitments (to herself?) that she can't keep. I struggle with whether or not I should be straight with her, or avoid pointing out what is so obvious to me. I think she would benefit from therapy and being able to read about her disorder, but how does one tactfully say that to someone who is mentally ill? Am I the wrong person to do this? What if she has no one else that will? I know I'm not responsible for her, but I don't want hear one day soon that she's dead and feel like I could have helped her.