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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The friends look back at how Ted, Robin, and Barney navigated their complicated history on How I Met Your Mother. "Platonish" is the ninth episode of the show's ninth seaosn.
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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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Marshall's on a mission to keep Lily from seeing a text message on How I Met Your Mother. "No Questions Asked" is the seventh 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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Barney's stuck in the middle when Robin has an argument with his family on How I Met Your Mother. "The Poker Game" is the fifth 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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HIMYM Quotes

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

Barney

You will be shocked kids, when you discover how easy it is in life to part ways with people forever. That's why, when you find someone you want to keep around, you do something about it.

Ted