Tell them you hate them then tell them you love them, throw things against the wall then sit down and read a book, run around cleaning things frantically for hours then lay in bed for days...see if they still want to stick around then...

You can't make anyone understand. You have to take your time and see if they are willing to learn, if they don't understand already. And if they do understand already, still take your time, and find out why exactly it is, that they understand. It is most likely because they either have some of their own problems, or has someone close to them that does.
If that is the case, you need to be sure both of you have your boundaries in place -- ie: you both are ultimately responsible for your own happiness, problems, and behavior, and don't blame each other, but always work together to solve problems.

That will be $60 for your first therapy session!!! LOL!!

Hmm...I'm not totally sure. I think no one can really fully understand it unless they too suffer from it, but maybe try giving them literature to read, or just sitting them down and saying, "hey...I have this disorder, and this is what it entails..." Then explain the symptoms as best you can. That's really all I would know to do in your situation. Hopefully others here will be able to offer you some better advice.

Keep your head up, hun, and don't give up. There is someone out there who will love you for you and won't let some illness stand in the way. ((hugs))

You have to explain to them what it is, how it can affect them, and ask them whether or not they will be able to handle that kind of instability. That, or get stabilized.

You know, it's not all your fault. What you need is to find a Real Man who loves you and accepts you and will never let you go. Nobody should have to explain or demonstrate BP, that's an insult to us BPs.
The thing is that you don't know what type of person you've latched onto until they go home crying to their Mama. Are they wimps?
Are they afraid? Hold out for the Real Man...

When I make new friends I always tell them straight up that I don't have a whole lot of friends, but the ones I have I'm really good to. Then I drop the BP bomb. I am blessed in that I have fairly crazy friends I guess so they are flexible, LOL.

Probably you need to find some people possibly older than you and more patient? All my g/f's are ten years older, except for one, but she grew up with me so she's seen this for EVER.