In December 2005, Rosie's ex-husband, Mike, is homeless and stays with the Millers'. Rosie and Mike have an affair, and she plans to leave Keith for Mike, taking Darren, Demi and Aleesha with them. Mickey and Dawn find out about this, and Mickey tries to convince her not to leave. Eventually, she decides she cannot take the twins away from their father, and chooses to stay with Keith. Rosie tells Keith about her affair, but does not mention she had planned to leave. Keith forgives her until Dawn lets slip that Rosie had planned to leave. Keith then leaves Rosie.