The main reason is that these two seem truly, deliriously happy and in love. The evidence: oh, just everything they've said about each other and how quickly — or efficiently — their relationship has deleveoped. Here is a timeline of their relationship milestones that'll make you believe in the adage of "when you know, you know."
After news broke that Meghan and Harry were dating, Meghan was subjected to nasty attacks in the tabloids and on social media. Despite being quite private, Harry gallantly — and very publicly — defended Meghan in a statement on the Kensington Palace Twitter account, urging the media and public to respect his new girlfriend's privacy. It just so happened to be the first time he publicly called her his girlfriend.
Even though the general public had known about the relationship for months by then, it wasn't until December 2016 that that the two were spotted together, out on a date in London. The two traveled back and forth between his home in London and hers in Toronto, nurturing their long-distance relationship. She also started wearing a necklace with his and her initials on it in the cutest (and most fashionable) subliminal declaration of love.
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5September 2017: Their First Public Event as a Couple
Over a year after Meghan and Harry had met their other important family members, Meghan finally met the queen, and it happened in the most British, most royal way: they had tea together.
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7September 2017: Meghan Gives Her First Interview About Harry
Following their engagement, Harry and Meghan visited Nottingham, England, for their first official appearance together. Kensington Palace tweeted that Harry was "delighted to be introducing the city to Ms. Markle," and she certainly received a warm welcome.
Harry and Meghan are going to be parents! Kensington Palace announced the exciting news during the pair's first royal tour as husband and wife in Australia. "Their Royal Highnesses The Duke and Duchess of Sussex are very pleased to announce that The Duchess of Sussex is expecting a baby in the Spring of 2019," the statement read. While Harry and Meghan are keeping the sex a surprise, baby Sussex is due in late April.
Even though Meghan is just months away from giving birth, she's showing no signs of slowing down. In February, Meghan made a special solo trip to NYC to celebrate her baby shower with her friends, and shortly after, she and Harry embarked on a three-day trip of Morocco.
Meghan is expected to start maternity leave at the end of March, and after that, it's only a matter of time before baby Sussex arrives.