Slowly, wow indeed. Though I agree with Ellie that OW may not take this as definite enough, the good news is definitely the words "I want" and all the stuff about wanting a R with *you.*
As I have been all along, I'm still perplexed by why he had the A in the first place (since he supposedly never wanted to leave you, right?).
Since I am one whose WAH has voiced resentful, angry, bitter thoughts about shortcomings, failures, selfishness, etc on my part......some definitely justified that I have worked/am working to change and some unfair or one-sided......I don't see my H writing these words for a long, long time. He *might* feel, and tell her, that he needs to return for the sake of the kids, but that is different, isn't it? And all of his negative thoughts about me are magnified as justification for continuing the affair. I guess my question is, was it ever like that for you? Or was he always this positive about you, and clear about wanting you, but hoping to have it all?
As hard as it is to believe it's real, I think you're in good shape here (and I'm glad!).