Jesus also told us to do to others as we would have them do to us! Who here would not feel they had the right, as a creation of our Lord’s, to know when they had been lied to and cheated on.
Actually, this did happen to me. Being cheated on (once), in a moment of weakness, I believe most women can forgive (although, the statistics i’ve read numerous places, say that once a spouse cheats it usually happens again in the vast majority of cases). Being lied to about it over a period of time is something totally different. The trust, which may have been shaky before, is totally gone.