That answer was flippant and I apologize.
I think 'put it on a bumper sticker' is the best policy.
Alcoholics in our disease just can't HEAR more than a few words at a time.
Short Sweet but FINAL.
"I want something altogether different in life."
Whatever you come up with along those lines.
Honesty is great:
"I'm not happy and I don't want to be in a relationship with you."
Ba ZINGGG
If you don't WANT to mention the alcoholism then don't.
But I truly wouldn't wait until wednesday.
That's too much buildup.
Too long to make it much more than what it realoy is in our heads.
Just make a call and say however you want to word it.
You have the right to stop seeing someone without a lot of explanation.
I truly hope this is the only time for you.