 Mark 's other housemate , Kyle Canning ( Chris Milligan ) , gets in from work and realises Mark is leaving because of the harassment he has received due to exposing the corruption within the police force . Mark admits he is going into witness protection and he and Kyle say their goodbyes . Sophie decides to go with Kate and they hurry to meet Mark . At the meeting point , Mark 's boss , Duncan Hayes ( Paul Ireland ) , arrives and asks if Mark is ready . He replies that Kate is on her way , as he hands his wallet and phone over . Sophie struggles to keep up with her sister and tells her to go to Mark , as they can collect her on the way . Kate continues running , just as it starts to rain . Hayes tells Mark that they need to leave , but Mark asks him to wait for a few more minutes . When Kate reaches the meeting point , she finds no one there . Sophie questions whether Mark changed his mind and Kate runs home to Ramsay Street . She enters Mark 's house calling his name and then receives a text message saying " I love you " , which Mark sent from Hayes ' phone . Kyle comforts Kate while she cries about Mark . 
