Well first of all your by saying/showing that your willing to find out about his disorder shows that your love him.
By just being there for him is enough, it does take a strong person to be with someone with the disorder and patience is one of the biggest keys as well.
I'm very lucky as I too am in a relationship, sometimes I wonder why he is actually doing still with me (it's been two years!).
There will be some tuff times where he may feel like hes pushing your away, but deep down he's not.
I wish you and him all the best!