Is Telegram Used for Cheating?

My sister downloaded Telegram and saw my husband had it. His last activity? February the same time he went on a "work trip" with his buddy. He shaved down there for the trip (which he never does) and said it was for "hygiene." That night, they hit bars and house parties, and we fought at midnight because something felt off.
Why would he need Telegram if he could just delete messages? And why stop using it right after the trip? Am I overthinking, or is this suspicious?

Is Telegram Used for Cheating?
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