I would suggest talking with your man to see how he feels on the progression of the relationship. I'm in a similar situation loldrey, I'm hearing and my man, Darin, is deaf. I'm currently learning ASL and we don't find it hard to communicate but some things to ask him maybe that I've asked my man are:
Does he feel comfortable with you interpreting for him? I asked Darin this because I just did it automatically but never considered what his feelings may be on it. Maybe he doesn't want me to interpret for him at the register for food, on dates etc. He said he was fine with it and even encouraged me to help with my signing skills.
What kind of progression are you two looking for? Slow? fast? In my own relationship, we've agreed to take things slowly, which at first I was like WHAT?! But after reading from the book in my ASL class ("For Hearing People Only") it gave some differences between hearing/deaf cultures, things I hadn't even considered. One of which previously mentioned was eye contact and the ramifications of dropping it.
Also previously stated is communication. I wanted to be able to contact Darin better than just IM/text/email so I got a new webcam and downloaded Viable Vision so I could videocall him to his VP. Does he have a VP? Something to consider as well.
Finally, yes there are some differences but to me if you treat them as differences then that is how they shall remain. Different. If both of you embrace both cultures, and sometimes it may mean giving up a few things too, it will really open your heart, mind, and world a lot more.
Hope this helps and best of luck
~*~Carly~*~