Why? Why? Why just why?

So this man I've been spending a lot of time with lately has suddenly lessened the amount we communicate.
We used to talk every day all the time, but lately as in the past few days the communication is hardly any. I don't understand this because I spent Thursday-sunday night at his house and I thought we had a great time. So why would a guy just randomly stop communicating the way he used to?
I'm so cconfused. Please someone clear things up for me.
Why? Why? Why just why?
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