How do you make someone with BPD understand?

Tell them that you really want to understand, and ask if they can say more about what they are feeling and why. Give the person hope for recovery by reassuring them that people with BPD can and do get better. Accept that the person is struggling and that life goals might need to be broken down into smaller steps.

How does a person with borderline personality disorder behave?

Wide mood swings lasting from a few hours to a few days, which can include intense happiness, irritability, shame or anxiety. Ongoing feelings of emptiness. Inappropriate, intense anger, such as frequently losing your temper, being sarcastic or bitter, or having physical fights.