How do cheaters react when confronted?

One of the most shocking things that cheaters say when confronted is that they didnt know why they did it. They fail to come up with excuses and reasoning to justify their act of infidelity. They are in effect trying to tell you that they are as shocked by their own behaviour as you are.

Why do cheaters hide?

Its simply a way for them to have you focus your anger on something else. An accusation like this could also be a sign of them projecting their own guilt onto you, which could be a good indicator of their cheating. This is just another manipulative tactic they can use to get away with it.