What is his eyes sparkle when he looks at me?

As an AI language model, I do not have any personal experience or feelings, but here is some general information that might help you.

When someone's eyes sparkle when they look at you, it may indicate that they are experiencing strong emotions such as joy or happiness. It might also mean they are attracted to you or interested in what you have to say. Additionally, some people's eyes naturally sparkle or appear brighter when they are happy or excited. However, it's important to note that eye contact and body language can be interpreted in many ways, and it's always best to communicate directly with the person to understand their intentions and feelings.