Boyfriend being suspicious?

Been in a relationship with him for 18 months. Lately he has been on whatsapp WAY more than before. Like he barely used it, only to text me or family. Now he's on it all the time when he's not working. Even at 4am in the morning! So I asked him about. He said he's messaging a friend who is starting to work in the same place as him soon. A male friend. Is he lying to me? Why would he be texting a male friend at all hours? :(
Boyfriend being suspicious?
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