He says "I'm sorry, I'll try", but no change...

I'm writing for the first time hoping to receive some insight. My husband has ADD, takes meds and is aware of the challenges it has posed and continues to pose in his life. I have read all the books about ADHD and he reads them when things get bad and he feels he "should".  We have been to much counseling but he doesn't follow through and do or stick with the advice and tools he is given. When i explain the pain and anguish, he says he's sorry and he'll have to try harder. I know it's not about trying harder! It's about using the right tools, changing bad habits and working on it daily.  He says he wants a good marriage but doesn't do the work.  I'm the one that keeps fighting for our marriage and he is aloof.  As the cycle just keeps repeating itself, I've lost patience and hope.  Is anyone experiencing this?