First of all, congrats on 19 days. I am sure you are working hard for this, be proud of yourself!
I have not said the same thing to my AH but I think it every single day to be honest. In all fairness, it took a very long time of his drinking and relapsing to get us where we are today. He has made alot of promises that this is the last time. Unfortunately, they were not. Will it be this time? Only he knows.
Trust is built up over time. Please please keep that in mind. You want to prove him wrong and that is what you will do if you are serious in your sobriety. I get this very same frustration from my AH and I explain to him, it did not happen overnight and it won't get better overnight. I am protecting myself so to speak.
Good Luck to you. I hope you continue on because it is what YOU want from YOURSELF!