I’m reading the wikipedia [page](https://en.wikipedia.org/wiki/Work_spouse#) for it here and it’s specifying that it’s a American English term, which surprised me. It’s not uncommon here to have someone you consider to be your work wife or work husband. Hell, I’m in college and there’s two people who are work spouses.
The term (at least to me) isn’t meant to imply emotional cheating or anything like that, although I can see how it might lead to that sort of thing depending on the situation and who you are as a person. I was just curious to see a) if it was common in Europe and b) if there’s a specific term for it.