What does it mean , when a guy suddenly started being rude?

Anonymous
So I've been texting this guy i met online 2-3 weeks ago, we live in different countries.
so when we started texting it was nice, we were texting for long hours and for like 2 weeks we texted very nicely (even talked on calls for like 2hrs first three days) but suddenly our exams started and our convo became less (not very less , for eg if we were talking for 4 hrs so then now it was 2hrs) and my exam ended first so i completely didn't text him for one day because i thought i should give him space to study (and my exam went bad so i was sad). after a day , he initiated the convo and we didn't talk much becuz he was studyingday after that he was partying , so i guess that's why we didn't talkand the day after that, i asked him if we want to vc.. and he said no because he has assignments so.. i got sad (and embarrassed for asking) the convo got awkward so i sent a voice note saying "stop making everything awkward and all..." in a very rude and angry tonei didn't wanted to get angry or anything it just did (it was unintentionally) but then i said sorry and he said no problemthe next day , that was yesterday, i said hi hello again and it was fine (the convo ) later at night around 2am.. he suddenly snappedhe was sending me stickers which says "bitch stop texting me" and other rude thingsnow i don't know:/. why and what i did (though i do agree i was kinda sad n angry and overreacted)
What does it mean , when a guy suddenly started being rude?
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