If my fiance is telling me that he will slow down on his drinking to try for a baby is it usually a lie?

My fiance and i have been trying for a baby for a year and a half. He has a drinking problem and he told me that he will slow down on his drinking to better our chances. however, i don’t believe him. do alcohols usually lie when it comes to those types of stuff?
If my fiance is telling me that he will slow down on his drinking to try for a baby is it usually a lie?
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