My boyfriend replies late on purpose?

Me and my boyfriend have been dating for 1 year and a half.. the problem is i know he really loves me but he always replies after hours purposely I don’t like to be needy or annoying so i asked him once and gives trivial reasons. He always initiates the calls and whenever we talk on the phone he is really interested laughing and loving.. I can’t understand him he is working abroad but it’s not easy for him to get internet.. whenever i send him something on whatsapp he doesn’t reply but he was only on messenger.. is he cheating on me? by the way he always calls me everyday but whenever i text he doesn’t reply what could be happening? And what to do?
My boyfriend replies late on purpose?
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