If you was going through a particularly bad time in your life and your oldest, closest friend didn't even pick up the phone or pop to see you would you be upset? We do chat on Whatsapp but nine times out of ten it is initiated by me and it will be four or five messages with her generally taking hours to reply or not at all after the few messages. If it was the other way round I would say lets have a catch up or at the very least ring her. Am I being oversensitive?