The fifth season of Married at First Sight premiered on 29 January 2018 on the Nine Network. Relationship experts John Aiken, Mel Schilling and Trisha Stratford all returned from the previous season to match eleven brides and eleven grooms, including John Robertson who previously appeared in season 4.

Couple profiles No. Couple Age Home Occupation Honeymoon Final Decision Status 1 Sarah Roza 38 Melbourne, Victoria Beauty specialist Cairns, Queensland Yes Separated Telv Williams 33 Perth, Western Australia Machinery technician 2 Tracey Jewel 34 Perth, Western Australia Marketing consultant Fiji No Separated Dean Wells 39 Sydney, New South Wales Executive creative director 3 Alycia Galbraith 29 Adelaide, South Australia Student Fraser Island, Queensland Broke up before final decisionSeparated Mathew Lockett 32 Melbourne, Victoria Plumber 4 Jo McPharlin 39 Adelaide, South Australia Single mother Singapore Broke up before final decision Separated Sean Donnelly 39 Adelaide, South Australia Pub manager 5 Davina Rankin 26 Brisbane, Queensland Personal trainer/bikini model Cook Islands Broke up before final decision Separated Ryan Gallagher 29 Sydney, New South Wales Tradesman 6 Charlene Perera 33 Melbourne, Victoria Brand manager Tasmania Yes Separated Patrick Miller 34 Melbourne, Victoria Operations manager 7 Melissa Walsh 53 Mornington Peninsula, Victoria Journalist New Zealand Yes Separated John Robertson 54 Melbourne, Victoria Business owner 8 Ashley Irvin 28 Brisbane, Queensland Flight attendant Broome, Western Australia No Separated Troy Delmege 35 Sydney, New South Wales IT accounts manager 9 Gabrielle Bartlett 44 Sydney, New South Wales Marketing coordinator/plus-size model Samoa Broke up before final decision Separated Nasser Sultan 50 Sydney, New South Wales Fitness instructor 10 Carly Bowyer 32 Melbourne, Victoria Marketing manager Vanuatu Broke up before final decision Separated Justin Fischer 41 Sydney, New South Wales Entrepreneur 11 Blair Rachael 31 Sydney, New South Wales Executive assistant New Zealand Broke up before final decision Separated Sean Thomsen 34 Perth, Western Australia Railway technician

Commitment ceremony history Episode: 9 13 17 21 25 29/30 Ceremony: 1 2 3 4 5 Final Decision Sarah Stay Stay Stay Stay Stay Telv Stay Stay Stay Stay Stay Charlene Stay Stay Stay Stay Stay Patrick Stay Stay Stay Stay Stay Melissa Stay Stay Stay Stay Stay John Stay Stay Stay Stay Stay Tracey Stay Stay Stay Stay Stay Dean Leave Stay Stay Stay Stay Ashley Stay Stay Stay Stay Stay Troy Stay Stay Stay Stay Stay Gabrielle Stay Stay Leave Stay Leave Left Nasser Stay Stay Stay Leave Leave Carly Stay Leave Stay Stay Leave Left Justin Stay Stay Stay Stay Leave Blair Stay Stay Stay Left Sean Stay Stay Leave Davina Stay Leave Leave Left Ryan Stay Stay Leave Jo Stay Leave Left Sean Leave Leave Alycia Stay Left Mathew Stay Notes none 1 none 2, 3 none Left none Alycia & MathewBlair & Sean This couple left the experiment outside of commitment ceremony. This couple elected to leave the experiment during the commitment ceremony.

Controversy Contestants Dean Wells and Davina Rankin were involved in a cheating scandal that blindsided their respective partners, Tracey Jewel and Ryan Gallagher. Dean and Davina had planned to write "leave" at the commitment ceremony, but instead Dean chose to stay with Tracey and deny any wrongdoing when Davina called out his lies over their affair. Dean further infuriated fans when during a "boy's night" he led a conversation on wife swapping and asked the other grooms if any of their wives' mothers were attractive.

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