Miller, who was paired with his best mate Jordan on the LEGO building reality show, told 9Honey that his connect to Marielle's partner Kaitlyn was instant!
"We were friends from when we first met, and we'd hang out during free time in between filming. But I had no idea Kaitlyn liked me," he admitted, adding that the other contestants played Cupid.
"I was completely oblivious to Kaitlyn's flirtations. The other contestants had a lot to do with us getting together."
Miller added that it took a few dates for them to admit their romantic feelings.
"We went out on a few dates but it was still kind of as friends," he explained to the website.
"Then we went and had breakfast one day, and I kind of just leaned over the table and said, 'Kaitlyn, I've just gotta get something out the way. I just want to make sure... Is this... Is this a date?'
"'And she kind of said, 'I don't know. Is it?' and I said, 'I guess it is now?!'"
And the rest, is history!