The secret letter The Bachelor's Megan Marx was given by winner Alex Nation.

The Bachelor favourite Megan Marx – who has since found love with fellow contestant Tiffany Scanlon – has given fans an inside view of what really went on between the women while in reality TV show’s mansion.

And it turns out, things were super lovely behind the scenes.

Megan shared a snap of a letter eventual winner Alex Nation wrote before her very first date with Bachelor Richie Strahan.

Captioning the image of the letter on Instagram, Megan added that her time in the house felt like “a dream”.

Moving house and found this treasure @alexandranation Good God that life seems like a dream now. #thebachelor

A photo posted by Megan Marx ???? (@megan.leto.marx) on Jan 7, 2017 at 10:28pm PST

“Meags (ya weirdo”!” the noted, dated March 17, begins.

“Wishing you all the best of luck on your very first date with Richie.”

Alex also offered Megan some advice for her date, telling her to “be true” to herself.

“He will soon come to find that you are amazing! How could he not!”

Despite their noticeable chemistry, Megan shocked fans when she refused to accept a rose from Richie later in the show.

Megan has previously revealed that Alex was the only person she told about her decision.

“I hadn’t told any of the producers of any of the crew. The only person I did tell was Alex, so Richie had no idea,” Megan told news.com.au in August.

“It was a decision I wanted to make by myself without anyone convincing me. I’d been thinking about it for a little while…I knew that I’d leave,” Megan said.

“I don’t like drama, I don’t like getting yelled at. I was thinking, ‘What am I doing with my life? I’m 27 and I feel like I’m in high school again’.”

Have a look at Tiffany and Megan’s best Insta snaps: