Interesting question. My husband and I discussed what would have happened if I had been diagnosed before we met (instead of 10 years after). I decided that I wouldn't have told him until the relationship was going to be somewhat serious. Maybe the "this is getting to be love" phase where you decide to be exclusive. That's where I feel like there is an obligation to tell.
How to start that conversation? Oh boy, I don't know. I told my husband over the phone in a blubbering mess of tears. I don't recommend that method

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I take it this means there is a romantic interest, Slick. Go for it!
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Amazonmom is not putting up with bad behavior any more.