how does someone get bipolar

i am in a relastoinship with a person with bipolar how do i live with someone with bipolar i love her ?
i love her deepley and want to help her . she is on med’s butt ran out . she did not tell me she had bipolar till she ran out of med’s . how to cope till she get a refill . she is so cold to me now . butt i still love her with all my heart.
Please don’t treat her any different, she’s a person! I speak from personal experience with bipolar and tell her to please not to stop taking her medicine because she might end up in the hospital.
Please be supportive and understanding because that is what she might really need right now.
I always make sure that I have enough medicine and wouldn’t dream of going off the medicine without my doctor’s approval.
me talking about bipolar