He's suddenly only sending one word texts - what's up?

He's still replying to every text, except it takes him longer than usual and he's only replying with one word answers. But at the same time, any question I ask him he's asking me back. So he's keeping the conversation going but he's only giving one word answers and taking ages to reply. Usually he replies instantly and with long texts or several texts at once. Is he trying to tell me to f**k off?
He's suddenly only sending one word texts - what's up?
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