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The Fifth Amendment will only protect you if you claim you cannot testify because to do so would be to testify against yourself. If you say that you are "taking the 5th" they will assume you lied to begin with and are protecting yourself from false report charges by not testifying. You CAN however, decline to testify based upon the spousal privilege. I don't know what State you are in, but in Arkansas, most cases where the "victim" spouse declines to testify are dropped. I hope this helps, good luck.