as your reading probably told you, bp is not likely get better on ots own. non-treatment will only cause this disease to escallate until he will probably find himself in a hospital or in jail.
unfortunately we are all free spirits if we are three times seven or more. unless we break the law or are a danger to ourselves and others, noone can ever force us to do anything. this is the case with your b/f.
if yiou ry to push the point or nag, i don't care how much you might love each other (that's all hormones, anyway ) i wouldn't give your relationship a snowball's chance in hadies of surviving. that's your catch 22 conundrum. sorry, but i am always honest. as mark twain once said, "always tell the truth. it will confound the many and please the few."
having said all that, i believe there are some things you can try. was he actually diagnosed with bp or did a beam of light descend on him and he have a divine revellation? if he was dxed, when was it and who made the diagnosis? if he was diagnosed and if the dr who did the dx is local, you might try contacting the dr and tell him/her what is happening now. you might also ask the dr for suggestions to help your b/f get help. don't look for miracles. but i do believe in them and have actually seen or experienced a few in my lifetime. maybe you can expect one but don't look for it. am i having one of my episodes again? oh, my. sorry about that. maybe i need another pill or something?
i hope that you at least got a smile and that you perhaps got some information you can use. i wish you the best in dealing with this delacate situation.