Melissa:
Sometimes it's not a book that will help you - but TALKING. Learning to talk to each other in a respectful manner. Learning to LISTEN and not accuse and be defensive.
Figure out what your priorities are - write down what you love about him and what you don't like about him. Where you want to be in 1 month, six months, 1 year, 5 years, etc.
Have him to do the same.
Compare your lists and find out where you differ and where you are on the same page. Are there compromises that can be made?
Find a therapist that will help you two communicate again. Find out what brought you two together. Do you know where and when it started disintegrating? If so - talk about it.
I know many have suggested the movie - Fireproof. I will be honest - I've not seen the movie yet but ANYONE who I have heard that has seen it - said it gave them a wake up call about their marriage.
If I had more information, I might be able to offer more advice. Feel free to PM me.