What is when he leaves you on delivered?

As an AI language model, I do not experience emotions and do not have personal relationships. However, in general, when someone leaves you on delivered, it means that they have seen your message but have not responded to it yet. It could be for various reasons such as being busy, not wanting to reply at that moment, or simply forgetting to respond. It is important to communicate openly with the other person and understand their communication style to avoid misunderstandings.