Alcoholism is PROGRESSIVE
Choosing to stay with an alcoholic is like choosing to buy a seat in an airplane knowing it will spiral down and crash.
Alcoholics blame everyone and everything else except ALCOHOL
The "lovely person" when not drunk would be even lovelier if they were not alcoholic
Marriage and/or driving your car will make you liable for damage, injuries/deaths they cause DUI. You can lose everything you worked hard for; home, assets, etc
Not to mention innocent people injured/killed
You will continue to suffer dealing with the "insanity"
Would you look for a mate at a mental hospital??