Why is my guy friend suddenly acting so distant?

One day he is telling me that he misses me a lot and from almost talking to me everyday.. now whenever I text him, he does reply but his replies are really cold or it feels like he is just replying so that he won’t come as a rude person.. we have been really good friends for a year now. Suddenly he is acting weird. Why do guys suddenly act so distant?

Why is my guy friend suddenly acting so distant?
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