When a Boyfriend says goodnight and stays online on WhatsApp for hours after that, does it mean he is cheating?

Anonymous
I am in a long distance relationship. Our time difference is like 13 hours. So when I am at work at 1pm, it is 12am for him, and he is just about to sleep. We wish each other goodnight every day.

In the last couple of days, I have noticed, he wishes me good night earlier, around 10:30pm his time, but I notice him going online and offline on WhatsApp. And finally only sleeps around 2am. So very likely he is chatting with someone else on WhatsApp after he claims to be going to sleep.

A few other important points - he doesn't usually use WhatsApp cos he SMSs his other friends. As far as I know, I am the only person he WhatsApps. So this is really a distinctive change in his behaviour.

Am I being paranoid, or has he started talking to another girl? He might not have physically cheated or gone on a date yet, but I can't shake this gutt feeling he has met someone else.
When a Boyfriend says goodnight and stays online on WhatsApp for hours after that, does it mean he is cheating?
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