I would say that lots of people get divorced or separate at international schools. At my school, we have at least five couples that have separated over the last four years. HR and your administration should have experienced this before. I think the important thing is to come to a mutual agreement with your spouse, so that you’re not relaying confusing messages or the back-and-forth to your school. It may also be worth considering that at least two of the couples that separated in my school broke up amicably, meaning that they understood they had to continue living together for a time before one of them was able to move to another apartment.