Is it always necessary to be open and honest with your partner because YOU would feel less guilty?

Is it always necessary to be open and honest with your partner because YOU would feel less guilty?
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My opinion on this

If you done so messed up, that you feel guilty and it's hard to talk to them.

You must have did the nasty with someone. You deserve what you get
Is it always necessary to be open and honest with your partner because YOU would feel less guilty?
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