Living with /caring for someone who has BPD can be difficult, yet very rewarding.
They are generally loving, affectionate, passionate, loyal and, despite what many articles say, compassionate people. However, when things go bad the consequences can be overwhelming to deal with. The person who was calm, quiet and affectionate can quickly turn into an angry, loud and abusive tyrant intent on being right or, push you away, refuse to talk about what is wrong and go into isolation.
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There are usually outside triggers for these types of behavior, a disagreement or disappointment for example would be obvious reasons for their shift in mood but, other triggers such as a smell, sound, touch or noise may also have an impact...unfortuanatly the person experiencing them may not realize what has happened, just that 'this is how I feel'.

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I think it is important for the person who hasn't got BPD to remember that it is likely that the intensity of these moments can and do only usually last for a short amount of time. It may help to avoid triggers if you are aware of what they are - subjects, places etc. Another thing I want to stress is that being open and honest with them is vital, they need to know that they can trust you and rely on you - this is not to say you should cater to their every whim!