My partner left our 3 year old daughter on her own in the car while he went to the shop to get food. He said he was only gone for 5 minutes, she was happy to be left, she was strapped in her car seat and the car was locked. Am I being unreasonable to tell him not to do it in future? He is refusing as says it is perfectly safe. Opinions welcomed as not sure if I am being nerotic mum or not.