Darren and Mandy later start an affair behind Nancy and Luke's back. They have sex and when Luke comes in, Darren hides under the bed. Luke proposes to Mandy and she accepts. Darren pressures Mandy into telling Luke the truth and tells her he is going to tell Nancy, but later changes his mind. When Sienna is being stalked, she suspects it is Darren. When she asks Darren to fix a broken pipe for her, she knocks him out and ties him to a radiator. Darren convinces Sienna it isn't him and confesses to having an affair. Sienna promises to keep it a secret but later blackmails him into giving her two grand. Darren and Mandy end their affair on multiple occasions but keep turning to each other for support. When Nancy decides to foster Brooke Hathaway (Tylan Grant), the daughter of Becca's killer, Darren is against the idea but Nancy ignores him. After a talk with Grace, Darren decides to split up with Nancy and tells her their marriage is over. He runs into Mandy and they decide to run away together. Nancy suffers an MS attack and tells Darren and Jack that she will be in a wheelchair for a while. Darren meets up with Mandy and tells her needs to be there for Nancy and they break up.