Supporting girlfriend with possible BPD

Hello,

What brings me to the forum: I have been in a relationship with a girl for 1 year. In the 3rd month of the relationship i saw a diagnosis of bpd and possibly bipolar, or vice versa. She even asked me if i think she has those disorders. At the time, it was too early in the relationship for me to understand what it was all about. As time progressed, though some behaviors were so erratic that I was compelled to research the term BPD.

I notice: indecision, impulse and imagined perception of people disliking her or not caring about her, mood swings, recently a violent outburst of shouting or screaming due to a minor and negligible mistake (ie a plate of food fell down - i would not panic and simply clean that up, but she went into a rage). The decision to buy something takes weeks and months and the more the choices the worse the process is for me, and also her. her mind becomes upset, as i cannot seem to explain things to her in ways which for most people would be quite acceptable. And too because my advice or opinion is sought. She cant seem to make a decision by herself for such things. Self confidence issues, she is beautiful to look at but doesnt think much of her looks, 70% of the time she is immensely depressed about one thing or the other. Sometimes says wants to end her life. I assure her often.She has done DBT before according to her, but doesnt think much of it.

I am a generally very happy person at this stage of my life (though i have been through situational depression and through will power and some good friends determination expanded my understanding of life). But i do not know how to help my girlfriend and i am worried about her. I dont even know if her parents know this, whether they know that some form of treatment (DBT) etc is required. I would like to connect with somebody who might help me out in understanding how to talk to her. But sometimes i too am beginning to get depressed now in the obsessive thought patters she displays and the indecision on anything, and i am not sure how to ask her to seek help. I can never talk to her about my emotions, its as though it is my fault for asking things which one needs in a relationship. She is not a bad person, she even knows what to do , but cannot bring herself to implement strategies or decisions.