Why did my guy friend suddenly stop updating me?

He used to send me small things about his daily life, like pictures of the first food he cooks, the kid he was talking about and etc. Suddenly, he just stopped communicating without any words. He became distant and cold. He no longer start a conversation. He even told me that I know him well, before all these things happened. But right now, I no longer know him, he became a stranger to me. I also stopped talking to him. I guess our friendship is fading without me knowing his reasons.
Please share your thoughts, men. How could you let this happen to your close girl friend?
Why did my guy friend suddenly stop updating me?
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