Don't let the fact you have BPD deter you from a romantic relationship. I believe it's tougher when a disorder comes into play but it isn't impossible...not with the right person anyway. I would suggest, and this is solely my opinion, that you stay away from anyone else with mental health problems. I am not saying it's impossible but there is not enough space for 2 ppl mental health needs. My hubby is MI free and has been my rock, but if he had MI, I don't think we would have survived. Saying that, you can't help who you fall inlove with...it just happens.
Oh and I hope if anyone else has a s/o with MI as well as yourself, no offence intended....solely my opinion based on experience.
This seems to be a big issue for you

I for one hope you find the love and partnership you deserve