Why has he suddenly stopped talking to me?

Anonymous
So there's this guy I've been flirting with and talking to almost every single day for the past 2 months. Even if we hadn't seen or talked to each other that day I always got a goodnight text. and then suddenly he stopped. Stopped making conversations stopped asking what's up, stopped saying goodnight, and if I texted him he'd respond 7 hours later and not say anything to even merit a reply to. this has been going on for almost a week and I don't understand how a guy can say Goodnight Babe! and the next day want absolutely nothing to do with me. :(
Why has he suddenly stopped talking to me?
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