Originally Posted by
LexieCat 
An ultimatum might be considered the final boundary.
This is my thought.
"Never drink or else!" - Ultimatum
"I can't be around you when you're drunk, so I'm going to see the movie without you." - Boundary
"I cannot be married to an alcoholic, so the next time you drink, I am filing for divorce." - BOTH
As long as you set your Boundary Ultimatums wisely, with full intentions to follow through on them, I believe it is
very healthy.