The distended abdominal sounds like ascities and the slurring speech could be hepatic encephalopathy.
He needs to be under the care of a hepatologist to evaluate his symptoms. Best of luck to you both.
If he really isn't drinking, those ate not good signs. Unexpected things can happen when you have cirrhosis. It's time for a Doppler ultrasound or a CT scan, don't you think?
Cheers,
Mike.