cmt ...
The best thing to do -- as with any relationship -- is be open with your boyfriend about your feelings and concerns. It's important that he know what you are feeling and how his mood swings are affecting you. This is true regardless of the cause, whether it's due to swinging blood sugar levels or some other factor.
As part of this conversation, it would probably be good to get a better of understanding of how much he wants you to know or be involved with diabetes management. As Heather mentioned, it would be good, at a minimum, to know how to address highs and lows (particularly lows) in case something happens when you and he are alone.
The fact is, if you and he intend to have a long term relationship, there are things you will need to know -- just as it will be important for you to respect his autonomy on certain things (as Heather points out, what to eat, etc.).
Hopefully, none that information should make or break a relationship. However, communication and his willingness to address your concerns in a constructive way may tell you some important things about how your relationship may go in the future.
I'm heartened to see someone who has so much interest in someone with diabetes. I go through spells where I figure I am "broken" and no one would want to "take me on" (so to speak).
Good luck with everything.
---Ed
PS -> Just call me "Dear Eddie"
