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This guy is an ex-boyfriend of Penny and the fiancé or now-husband of Penny's friend or former friend Gretchen.

He is seen in "The Tangible Affection Proof" where he and Gretchen are having a Valentine's Day dinner at the same restaurant Penny, Leonard, Howard and Bernadette are having their double date Valentine's Day dinner.

He then asks her to marry him in the restaurant and she says 'yes' and they kiss, getting applause from the other restaurant guests.