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Your ex is not able to take him to live abroad without your agreement or an Order from the Court
You can also go back to court to deal with the issue of when you see your son
Please ask if you need further details
Have you previously consented to the move or did the court say that he could take him abroad?
How old is your son?
Then he can only take him out of the country for up to 28 days without your agreement
If he has said that he will be gone longer you can apply for a Prohibited Steps order to stop him form doing so until the court has decided whether or not it is in the best interests of the child