As a married fella let me offer some oats to chew on. If you hide your gaming hobby from her (or him) in the beginning of the relationship then you are asking for later problems. After the third or fourth date with my wife she asked about going out on a saturday night and I said "I game with my buddies on saturdays, we been doing it for 15 years, how bout we get together on sunday?"
Now as a married man - my wife knows that gaming is important to me but takes a back seat to birthday parties, annaverseries, holidays and other special occasions. The nice part is while she does not like games, she does not resent me or gaming. It simply is a part of our life, like exersize, work, or watching TV.