Most Helpful Guy
find help first, find if there is an issue between you or if it's something to do with you alone. move from there, divorce as a last resort to end his suffering if you can't kick this. find a councilor who will try to save the marriage, lots of professionals jump too quickly to divorce, divorce is your last resort.
Most Helpful Girl
Wow okay so most guys aren't giving good advice, but as someone who lived with a sex addict, I suggest you see a professional therapist or attend rehab meetings or both. While hiding it might sound like a good idea, you're right about your husband finding out. You should see if you can get a one on one with a pro and get on a plan to steer you from the addiction