Experts evaluate Prince William & Kate Middleton's relationship.

Experts weigh in on Prince William's dating history with Kate Middleton.

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[{"selector":"#anim-c1da3317-4701-44e4-bc84-81f39e293279 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-1b086666-083f-4c65-b796-21c7a249cf0c","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-6672c575-4b44-45cd-b71b-25d76b4fd924","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Narrator Glynis Barber suggests Kate's integration into the Royal Family was difficult.

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Their relationship was only known to their closest circle of friends.

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Royal author Robert Jobson confirms their relationship was low-key.

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Prince Charles' past girlfriends reportedly called him "Sir," but William is not like that.

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The couple ultimately married and have become a beloved part of the Royal Family.

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