I haven't had the experience of being close to someone with borderline. I suppose I nearly could have. I began chatting more frequently with someone here who offered friendship. I know myself though. I have abandonment issues and I couldn't see that working well with someone who was very intense one minute and then, cold the next.
I think we need to do that in any relationship- figure out if our issues will intensify when being exposed to theirs. Sometimes it's better to steer clear for both people's sakes I feel.
Not the same but, I do think I grew up with a (suspected) narcissist. And, the same argument happens there. I can understand that for people actually diagnosed with NPD, it's got to be horrible experiencing so many people demonizing them.
Truthfully though- being around this person was catastrophic for me. I developed ideation aged 10 because of them. Because of their constant bullying, gas lighting and lying. Sure, there must have been stuff going on for them to make them act like that but, it's hard to feel sympathy when it has impacted your life so massively. It's hard to believe it's unconscious too. How can you unknowingly blantantly lie about someone? It feels targetted and malicious when it's happening to you personally.
I just don't know enough about borderline. I do feel massively sorry for anyone struggling though. I can feel sorry for NPD sufferers. It can't be fun to live with.
That said- I can see it from the perspective of those who are hurt too. Bear in mind, they can also be dealing with their own issues. Which may become intensified for them after being treated in a certain way.
I can relate to feeling emotionally overwhelmed- I've been through several bouts of intense limerence. I can also feel very intense emotions and needs for friendship. I don't think it is borderline for me but, I recognise I can become unhealthily dependent on others. I suppose to remedy that or, the risk of that and the hurt of being abandoned, it's become more comfortable for me to isolate. Not to say that's a healthy way of living though.
I do feel bad for anyone struggling and feeling compelled to do certain things. Out of curiosity, do you find you have to consider what you say, before you say it? Do you question whether some things will come across as trying to manipulate? That's got to be awful in itself- if you constantly have to check yourself.