Only you can decide what to do. What meds is he on?
Bipolar is treatable, but it won't go away. It fluctuates, and sometimes there are symptoms, sometimes there are long periods of normal mood. But there will probably be more episodes for him, his medication may need to be adjusted (his diagnosis was recent, and it may take a while to get the right drug/dose for him).
When I said he was ill and needed your support I wasn't talking about the pancreatitis. You need to research bipolar disorder and see if you have the stomach for a ltr with someone with it. He will probably binge again in the future. Do you love him enough? To make it work you will need to have sympathy and understanding, and to help him manage his illness. You can of course only do this with his acceptance of it and his co-operation and wish to be well.
It's hard not to blame someone for damaging behaviour, but it is not 'his fault' in the sense that he isn't as able to control urges to drink as someone without bipolar - I'm afraid it goes with the territory.
To get pancreatitis is pretty serious and if he has more binges he may have more episodes which puts him at risk of chronic pancreatitis. Don't know how much you know about it, but basically the pancreas releases lots of digestive enzymes. In pancreatitis booze inflames it and the enzymes are released and effectively start digesting the organ itself. If this happens too many times the damage is irreversible and it becomes a chronic problem that interferes with the effective functioning of the digestive system.
Really feel for you, you sound terribly upset :(
You need to ask how much you value your relationship with him. If he's the ideal partner, or at least a good one, when he is well, then you might be prepared to help him live with his illness. But if he's not, then you should probably walk away, though that sounds cruel.