I check server logs from time to time, and I see a lot of people have found this site by asking questions about loved ones with this disorder, or who may have this disorder. In the interest of helping some stranger I do not know, I'm going to answer them from my perspective.
I highly urge both you and the person you're concerned about to seek psychiatric advice. Borderline Personality Disorder patients are not crazy. However, the advice of a qualified therapist can greatly assist you and the loved one in your unique situation.
Once again, I am answering these questions from my own perspective. The general theme of the question is followed by the number of queries which have landed on my site in that theme.

• Living with/Loving a BPD patient (in a committed relationship) (2208)
• BPD and Infidelity (1495)
• BPD and Jealousy (875)
• borderline personality coworkers and supervisors (709)
• Borderline Personality joke (323)
• Diary of the spouse of a Borderline Personality Disorder patient (179)
• How do i tell her I think she has bpd? (172)
• BPD Fights (159)
• BPD Roommates, friends, aquaintences (147)
• How to leave someone with BPD (135)
• Diary of someone with Borderline Personality Disorder (122)
• Spotting borderline personality disorder (91)
• When to leave someone with BPD? (60)
• How to Deal with Borderline Personality Disorder Accusations of Cheating (48)
• BPD and child custody/divorce (38)
• W4M NSA (26)
• borderline personality and employment (25)
• how to tell others you have BPD (21)
• BPD, rejection, withdrawl and deafening silence (20)
• BPD "Snooping" (18)
• BPD Medication Treatments (16)
• What is Borderline Personality Disorder? (BPD) (13)
• psychological projection (or projection bias) or Freudian Projection (13)
• BPD and the military; How to drill with a BPD patient (12)
• The "upside" of BPD (9)
• What treatments work? (8)
• Borderline personality disorder, loser (7)
• Do bpd return after they leave or break up with you? (6)
• BPD and Nursing Homes (5)
• How to support BPD patients who are also victims of domestic abuse (4)
• Why do i miss a BPD boyfriend? (4)
• When your boyfriend who has a borderline personality tells you to leave, what does it mean? (3)
• What to do when a BPD refuses treatment (3)
• Taming the shrew (3)
• Are BPD good looking? (3)
• personality disorder of trying to be someone else (3)
• Borderline personality entertaining (3)
• BPD abusing animals (2)
• Borderline personality disorder child or sports (2)
• BPD and unrelated health problems (1)
• Confiding in strangers in personality disorders (1)
• Conquoring Borderline Personality Disorder (1)