I have always been the upfront sort of person. I never had anyone back away because it. I don't think they believe it would have the impact on our lives as it does. My current husband knew all up front, but it was the stable side of me he met up with. He wasn't prepared for manic or depressed side. He just couldn't believe he couldn't fix me if any thing went wrong. He realizes now that he can't fix me. And he prays I'll never be manic again. Even though he hates the depression, I did much more damage to the relationship when I was manic. All this to say, tell them before they get to that "we can handle anything as long as we are together" stage. Because then they know not what they do.