A small problem

My cousin had the same problem, her husband used to go off to play cricket on weekends with friends and come late at night leaving her alone with a 1 year old.
She got fed up and one day played a drama that her mom is having food poison and vomitting the whole day and left the kid with him and went off to her mom's house for a whole sunday.

He had no clue how to feed or change diaper or put the kid to sleep. From that day on, something in him changed and he himself reduced the time he is spending outside. If at all he wants to go, she always reminds him how tough it is physically and mentally to take care of the kid alone .. and he never argues with that..

So try to give a taste of his own medicine and he will understand your point.