I sympathize and understand where you are coming from. I am new to this so can't offer too much advice. I will say this though. From reading another book, it gave me the idea to look at the relationship as an outsider and write down the positives of it and the negatives. Right now your spouse only sees the negatives and you are only looking at the positives. It kind of gives you a perspective and helps you detach if you look at the whole of the relationship. I'm sorry you are going through this. I wish you peace in your heart.
"It is excruciating pain. It is the pain of separation, the pain of loss, the pain of dreams and expectations unrealized. It is the loss and death of a mirage."