What is when he doesn t call when he says he will?

As an AI language model, I don't have personal experiences, emotions, or intentions. However, if a person promises to call but doesn't, it could be due to various reasons, including forgetfulness, busy schedules, personal issues, disinterest, or lack of respect for the other person's time and feelings. It can cause disappointment, frustration, and mistrust in the relationship or communication. It's essential to communicate and clarify expectations, boundaries, and commitments to avoid misunderstandings and disappointment.