It's nice that Nikki is caring for him, but it's hardly in a mumsy way. Obviously the departure of Lea would be sad for Pete since the two were close and Lea hugged him for ages before she left - it was all a bit sad. But I reckon he'll be fine in a couple of days, especially with Nikki being there firstly, plus with all the changes going on in the house right now he'll hopefully settle in again and feel better eventually!
