Just because he has a dominant personality doesn't imply in any way shape or form that he's a Dom personality. Lot's of A-type personalities in the work place and social settings are actually submissives in bed...

and believe it or not... some are even... gasp... vanilla.

I suggest if you're truly submissive and he's not a lifestyler... move on. Look at all the people at all the various bdsm websites who are stifled by their vanilla relationships.