Hi and welcome singlemum
You don't make him drink. That's one of the standard lines we pull out when we're actively drinking and don't want to face up to responsibility or reality.
He may decide to clean up, stay sober and be a great guy like some of us have become again...or he may not.
You have to consider whether you'll be ok with him maybe not being ok...and it sounds like you've made your choice?
D