Heck yeah it's unfair. And, his behavior SUCKS! sorry for the term, if I've offended anyone... ehem...
My suggestion to you.... If you would like to change his behavior, you must change yourself. Just imagine if all of us here could buck up and stick up for ourselves and just walk away. If all women (or abused and mistreated men) could just say "No!" Who would people like that have left to treat badly? No-one. All you can do is set an example.
Karma works like this:
We don't get to see karma get back at the awful people who do us wrong. Instead, karma allows us to learn both sides of the same coin. The faster you recognize the other side of something that you just experienced, the faster you grow. However, there are those that just do not learn the lessons, and so their lives are stuck in a constant cycle of repeating the same thing over and over again.
He is stuck. He is not growing. He is not learning. He is not living.
What more could you want to teach such an awful person that what he is doing is wrong? That alcohol just masks things... and in the meantime, all of it just keeps adding up. Maybe go read some the thread over in the "alcoholics" side and listen to some of them riddled with shame and guilt for all the nonsense they create in their lives and the things they have done. Not all... but so many.
We can't change anyone but ourselves hun. ((hugs))