I totally understand your desire not to have to endure more mudslinging. Rest assured that in mediation, there's no risk that the mediator will believe what your ex says or use it against you. And enduring some of it might be very helpful. If possible, you might want to take the opportunity, difficult though it might be, to fully hear out your ex, and say something to the effect of "I understand that you feel that way. I apologize for any way I've contributed to our unpleasant situation....
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Is it already scheduled? Why not immediately?
2 lawyers agreed with this answer