Stop calling him your partner as of now: he is anything but and you’re enabling all this to continue by bringing there at all picking up the mess. He’s an alcoholic and as such will destroy both you and your son from the inside out. Your man’s primary relationship is with drink, not you, and it has never been with you either. He could well lose everything and still choose to drink afterwards
Think of your son here. What do you want to teach him about relationships ?. What is he learning from both of you here?. What is he going to remember the most about his childhood?. His dad being absent due to both work and alcoholism along with you as his codependent, tearful and otherwise preoccupied about her man telling your partner repeatedly to stop drinking. It sounds utterly miserable for both you and your son. And he is not going up say thanks mum for staying with your man.
Telling or otherwise asking an alcoholic to stop drinking never works. The only one who can help your man is he and he’s showing no signs of wanting to stop drinking. You did not cause this, you cannot control this and you cannot cure this. Those are the 3cs of alcoholism.
What did you learn about relationships when you were growing up?. Did you see similar as a child?. Get therapy for yourself to break down both the trauma bond and codependency issues. Your low self worth started somewhere, probably in childhood. Address it
in therapy.
You have a choice re this man and your son does not. Do not bring yet another child into this dysfunctional mess of a relationship. It is the height of selfishness to do so and you realise this. You certainly cannot stay with him now just because you want a sibling. It’s over.
Who is more important here to you: the alcoholic or your son?.
You can only help you and your son, not your alcoholic partner. Be brave and take the first, often the hardest of steps, out of this relationship. Do you have a network of family friends to support you?. You need to bust this wide open because abuse also thrives on secrecy. Contact Womens aid too and get their support. Your son will also thank you for doing that.