When my H had left, he told me in my face that "it's the best for both of us, I don't feel a thing for you, nothing!!" and he was calm and sounded confident and had been thinking about it for months...(that's when I lost my temper and was screaming and yelling etc.) He even told me I am the meanest person he had ever met and that I had destroyed his life, that he would have left years (!!) ago if it wasnt for the kids...
Sounds familiar, at least some of it? Based on what he told you, I wouldn't suggest you quit. If there is something else you are seeing, I can't tell. One I can tell you though, what you have been doing, isn't working. Let's brainstorm a bit and see what we can come up with...