I learned a new term today: work spouse. Apparently, these are the people or the person, who you spend your day with at work - and who can make your spouse jealous.
If that's the case, than I must be a polygamist, because I've probably 4-5 people (of both sexes) that would qualify at my work. (This is where I would make a tasteless joke about the lack of difference between home and work spouse).
While I can appreciate spouses being jealous of work spouse, I would caution them that it's good to have solid, professional relationships with those you work with. Not only does it make the day go by faster, but it also makes your presence in a company more valued because it can show you as a team player.
Of course, it's also important not to cross lines with your so-called work spouse. In my view, it's perfectly acceptable to see each other socially when others, including real spouses, are involved. It's acceptable to become friends or to decide to remain strictly professional, where families, interests, etc. are not topics of conversation.
Also, I'd remind people not to make your work spouse the only subject of conversation when discussing your day at work with your better half at home. That's how jealously comes about and once it's there, it's hard to get rid of. After all, you don't want to divorce either home or work spouse, so use your head!