Why doesn't he text?

Say a guy that you're in some kind of friends with benefits relationship with, that you've been seeing regularly (2-3 times per week), sometimes without sex and that you talked to via text everyday, has suddenly not texted you since you last saw him in person (two days ago).

Why is this? I know for a fact that he's not been out doing a lot of stuff, as he's studying for his exams. He has been studying for his exams before this radio silence, so he clearly does have some time to text me while studying. He's online a lot, but just doesn't send me anything. This long of not sending anything hasn't happened since we started talking about two months ago.
Why doesn't he text?
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