All of these answers are valuable! I think that I just need to figure out the when and how of it. I believe in full and up front honesty because I have been hurt too many times by people keeping things from me. I think that real respect is telling the truth. I just don't want things and conversations to go too far before I bring it up.

I thought of saying something like, "There is something important about me that I would like you to know..." and go from there. I thought about writing it because I express myself far better in writing than I do in person. It also makes it easy to be less nervous about it and I will be less likely to stumble on my words.

I think I worry because everyone has the horrible dating stories of someone who seemed so wonderful and so together but turned out to be "crazy." I don't want to be in one of those stories.

We are mature adults, I am in my 40s and he is 50, so I hope that he would be able to see me for who I am regardless of the illness.