Robin and Ted share a history. And it came out a bit on the How I Met Your Mother episode "Platonish."
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Ted takes Cassie on a date to a lighthouse on How I Met Your Mother. "The Lighthouse" is the eighth episode of the show's ninth season.
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Despite having multiple options, Ted still manages to make the wrong choice in his date for the wedding on How I Met Your Mother. "Knight Vision" is the sixth episode of the show's ninth season.
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Ted and Barney deal with their Robin issues on How I Met Your Mother. "The Broken Code" is the fourth episode of the show's ninth season.
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How does this blonde fit in to Ted's to-do list on How I Met Your Mother? "Last Time In New York" is the third episode of the show's ninth season.
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Barney and Ted face their future selves on How I Met Your Mother. "The Time Travelers" is the 20th episode of the show's eighth season.
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Barney uses his supposedly destroyed playbook to help Ted with his girl troubles on How I Met Your Mother. "Weekend at Barney's" is the 18th episode of the show's eight season.
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Ted worries when the Captain contacts him out of the blue on How I Met Your Mother. "The Ashtray" is the 17th episode of the show's eighth season.
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HIMYM Quotes

You are the love of my life. Everything I have and everything I am is yours. Forever.

Barney

Whatever you do in this life, it's not legendary, unless your friends are there to see it.

Barney