Why is he afraid I will leave him?

The guy I am seeing has this tendency to get really close to me, thank me for spending time with him and so on. He knows I like him a lot and yet he won't disclose himself fully.

When I asked him why he is not letting me in, he said that he is scared I will cut myself off from him for good.

What is causing a person to feel this way?

Is there something I can do?

Why is he afraid I will leave him?
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