Most Helpful Guy
Before I can specifically help, I need more information on the circumstances.
Generally speaking, your ex might feel that he is being replaced as the child's father by a stranger. I know that in my case, I have told the mother of my daughter that if she meets someone new, she cannot introduce him to my daughter until I have met him and laid out some ground rules with regards to how he treats my daughter (equally if I meet someone she gets to do the same).
As children tend to live with the mother after a break up, the father can feel that his relationship with his child is under threat. There is also a fear that the new man will be given more attention than the child and it does happen (see one of my questions entitled "Am I Unreasonable" posted about two weeks ago as an example).
Again, in your specific case I would need more information in order to help and provide a possible solution.
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Most Helpful Girl