If then what you say is correct and your partner holds permanent resident status in the United Kingdom then his divorcing you should not affect his status or equally have any bearing on any future application he makes i.e. for seeking naturalisation.
A spouse of an EEA national who is exercising treaty rights is normally afforded a five year residence card following which they can apply for permanent residency in their own right. After this grant of 5 years, a divorce from their spouse would not affect their entitlement or ability to work or to remain resident in the member state in which they are residing.
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