Hi Bunny.
He's 64 so not "old" IMO - mind you, he looks a lot older now.
I have a lovely support from siblings and wider family, we have no children. Also we've already been visited by Local Hospice, so things are in place for the end. I can phone them 24/7 if I need help - if he has a fall for example. I was so relieved when their support was offered, such a weight lifted from me (I'm 67 so would struggle to get him up off the floor).
I think he's weeping because he's depressed (because alcohol is a depressant), he's scared of dying (strange as drinking is speeding up the dying, but true), he hates himself etc etc. So many emotions and the addiction overrules EVERYTHING.
When you visit your ex you could ask to speak with the consultant. You are the mother of his child so I think you have the right to be prepared for what you may need to deal.with
Ask (consultant) if his liver is Decompensated. If it is then he's dying in the near future. If not then it's still able to repair itself. I found NHS site very helpful to my understanding.
Most alcoholics relapse. They can go years on and off the wagon without irreparable liver damage, but it's Russian Roulette. The next sip could be the tipping point and there's no way back then.
I knew he was likely to relapse once he started feeling less terribly ill and frail. I've tried hiding his debit card so he can't buy any booze, but you cannot live like that. It has to be his choice. We tried that before and it's completely unworkable.
Good luck, it would be nice to stay in touch on here for support or just a really helpful vent of the rage and angst. I hope you do.