Our expert says:
Its not a true adiction, but of course it can be a major problem where someone chooses not to control their behaviour in this way ( and this is why CBT is a useful form of treatment for it ).
Its a fair measure than any such behaviour is pathological and needs treatment, where it negatively affects marriage, relationships, and the welfare of children. That he closes the programs when you come near is suspicious, and more often relates to someone getting too involved in emotional and sexual chat sites, rather than online games as such. So as you suspect, there could be an unwise relationship here.
But its not an issue of "signs", but of frank discussion, calmly, firmly, but not unpleasantly, making it clear that this behaviour is suspicious and hurtful for you and the kids, and has to change.
Lets see what other readers may suggest
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