I lived BPD. Someone who has it and does nothing to fix it is hard to live with, but you just have to be patient. It takes someone with great understanding to be in a relationship with someone who has been diagnosed but does not search for answers or refuses to accept them. My mother is bipolar but has also recovered over the years, we broke contact for some time but since I faced all my issues I truly understand why she did what she did. Now she's my role model. Bpd is a very sensitive and abandoned person so you just have to let him/her know how you feel about them and love them more often than most people, but to say 'stay away from that person' is very immature and misunderstanding to their childhood. If you are codependent or an enabler then you can not have a healthy relationship with anyone who lives a mental disorder, you can not fix another person.