Why do men emotionally cheat and then lie and defend to the point of being faced with proof of lie but still deny it?

My ex has been emotionally cheating on me and denying it for over two years. Every time I catch him lying I have proof either a screen shot a dated message a secondary text now account. He has two phones says one has more storage that’s why he needs both. Often showers with them so I won’t see a message pop up or a notification. Claims he’s not talking to anyone online and when presented with physical data says he must have been hacked cus it’s not him

Why do men emotionally cheat and then lie and defend to the point of being faced with proof of lie but still deny it?
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