The Netherlands is especially anal about dual Citizenship. When you gain dutch citizenship, you must give up all others, and the when you gain other citizenship, you must give up the Dutch one.
The only way to be a Dutch dual citizen is to be from a place that won’t let you give up citizenship (Turkey is famous for it here), or to be born to parents with different citizenships. (Or to get grandfathered in from before the laws got this strict)