{{{{{Corri}}}}} Just one word of advice from a guy's point of view. Don't base your thought that you've left no stone unturned on his statement that "Because our relationship sucks and that's just the way it is." People say things in arguments that just come out. These statements are not necessarily The Truth. They aren't thought out. They just come out. Don't end the relationship based on this statement. It's possible that you could mention to him today that he made this statement yesterday, and he wouldn't remember it. I don't know if it's a guy thing or just a people thing.
I'm sorry that you two are having communication problems, and that he is so insensitive.
On the bright side, maybe our divorces will be final at the same time and we can have drinks together!