Is prince william still dating Kate Middleton?

Is Prince William of Wales (William Arthur Philip Louis; 21 June 1982), the elder son of Charles, Prince of Wales, and Diana, Princess of Wales, and grandson of Queen Elizabeth II and Prince Philip, Duke of Edinburgh currently in a monogamous romantic relationship with Catherine, Duchess of Cambridge, the wife of Prince William, Duke of Cambridge, the second in line to the thrones of the sixteen Commonwealth realms?

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Show reasoning Reasoning

I followed this chain of reasoning:

By calculation (generator: ["now@trueknowledge.com"]) I know that:
The current time is May 20th 2013, 12:48:33

I know from locally stored knowledge that:
Fact 1: Prince William of Wales is in a romantic relationship with Kate Middleton ([fact: ["129904214@trueknowledge.com"]])

Fact 1 is true for June 30th 2008, 00:00:00 onwards ([fact: ["129904215@trueknowledge.com"]])

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:
Fact 1 is true at May 20th 2013, 12:48:33

I used the following facts to provide this answer:

Prince William of Wales has been in a romantic relationship with Kate Middleton since at least June 30th 2008, 00:00:00

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