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Dont be frustrated. Try to be more empathetic with him. He has grown to trust and confide in his mum. Weaning him off this, is a gradual process.
However, if you both discuss and agree over something, then due to his mum's influence he changes it without your knowledge or input, then you seriously need to register your displeasure.
Let him know how important it is for him to lean more to you than his mum, as this is how it will be in marriage.