Our expert says:
He sounds like an enthusiastic drinker, if not necessarily alcoholic, and likely to remain working abroad as it enables him to evade his family and marital responsibilities and live as he wishes. It is possible ( even by a letter ) to inform him calmly about how you feel and what worries you ; and especially where it can be phrased in the form of "when you do X, I feel Y", so it is less accusatory, he may take it more seriously - if he is at all willing or able to do so.
Let's see what others suggest
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