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I agree she should tell you, but unless there is something in the divorce decree or custody agreement that requires one parent to disclose that information to the other, then there is not any legal obligation to do so. What one party does in their private life is generally not subject to scrutiny or approval by their ex.
However if you have verifiable concerns about the person your ex is seeing regarding the safety of your daughter, your recourse here is to file a motion to modify the custody agreement so as to require either party to disclose who they are dating at the time. I don't know if it would be ordered by the judge as that is a fairly serious infringement on a person's right to privacy. But if you can tie it to something negative, like the person is a felon or a drug user or an alcoholic or someone with a long criminal record, and they are going to be around your child, then the judge may rule that the child's safety trumps the mother's right to privacy in a situation like this.