What does it mean when he stopped texting for a week?

There’s a guy I been texting for a week then suddenly says he’s drained and mentally. Is he not interested or bored of me. I wanna know from a guy perspective cause it gets me all confused. I thought things are going well and yet he’s always online or on Snapchat and he was suppose to call last night but doesn’t.
What does it mean when he stopped texting for a week?
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