Due to family reasons (my wife got a great job overseas) I have to relocate and quit my job. I had a notice period of 2 weeks, but I have filed a resignation on the hands of my manager 3 months in advance. I thought that he would be happy with early notice. Instead it turned out that he has no idea how to use this information and asked me to file resignation later with only 2 weeks notice and also to not reveal to anyone in the office that I will be quitting.
It's a bit tough as I am on friendly terms with a lot of coworkers and normally I would definitely casually mention something like this.
Is it a reasonable behavior of a manager? What could be his incentives? Should I even consider to obey his request to not reveal my departure to others?