I don't think it is so soon but it's subjective really.

I do think however it's important to let the person get to know you for who you really are so that it is less likely a dx will define who they see you as. After that then it would seem like an ideal time to bring it up. And it is something that should be brought up early in a relationship because it is a major health concern. They have a right to know if you have a problem that can profound effects on you as by being in a relationship it can have implications for them too. (just speaking in general terms here)

It's fine to keep secrets about insignificant things but I believe openness & honesty are the cornerstones of a relationship. Keeping something as big as a serious mental health problem from them for any significant amount of time in my mind is almost like lying to them. It's a part of who you are.


Well that's promising then, it shows he is more likely to be open-minded about mental illness if he has a book on bipolar. I can understand why you might see it as a little intrusive to bring that up though.