My wife is currently drinking and it gives her a lot of guilt. We've quit several times together because I always insisted that we won't be successful unless we do it together. I finally realized that a person has to have internal motivation to quit.
We've talked quite a bit about addiction and she visits a similar forum. There is nothing I can say to get rid of her guilt and I know that doesn't help matters. In the past I've used her relapse as an excuse to start drinking again which just added to her feelings of guilt. I just hope she hasn't given up.