Ooh, what a question--this is gonna be a long post! I believe that if my wife had to state the top two things that he she hates about me pool would be one of them. I can't blame her too much--when she met me I was in the early part of a 5-year hiatus from the game. Simply put, the poor thing had no idea what she was getting into!
When I started playing again in late '97, no one in the VI had seen me play for 5 years, and I had been in MA (hi Fred!) for most of the preceding six years. In short, I had action! Therefore, my wife immediately began to experience the fate of the pool widow since I confess to having religiously followed the moral and financial obligation not to quit the game until the poor opponent either went broke or pulled up. For a while she swore that I had to be seeing another woman.
Then, in '99 or so, I was introduced to the larger waters (and bigger sharks!) of the international pool world and two things happened--I really began to improve, and I began to travel more (let's say about three to four times a year). I should add that my wife detested the game so much that up until about 2002 my wife had never even seen me play--and this was during a period when I had won the V.I. Championship along with numerous other local tournaments, beaten one of Puerto Rico's best players in "match play" (on St. Thomas), and had enjoyed success in tournaments in the Caribbean and on the U.S. mainland. I couldn't understand why she was so totally unwilling to be any part of what was such an important aspect of my life, and she couldn't see what could induce me to spend so much time and energy hitting balls into pockets with a stick. During this period, I even opend a pool hall, thus making my immersion in the game complete. She was supportive, but the distance between us was like the Grand Canyon.
Our marriage was probably (I should say definitely) saved by the fact that the pool hall only stayed open for 3 years. After it closed, I was so disillusioned with the state of the game on St. Thomas that I stopped playing for another two years, and my wife and I began to rebuild our closeness. Finally, this September, I was able to convince my wife to let me play again, and she is beginning to understand that pool is too big a part of me to just let it go. She's even watched me practice a couple times, and she says she had never seen the person that she saw on the pool table. I am now on a carefully monitored schedule, and we'll see how it goes.
There it is, the confessions of a (reformed?) pool addict!
In short, if you're going to be a married pool player, your spouse has to at least understand your love of the game, you've got to establish a mutually agreeable schedule that you can stick to, and you've got to go the extra mile to make your spouse feel special and not second fiddle to the game.
) , but in addition to workaholic, the word "hobbyaholic" was mentioned. 
