I recall it was you who stated I should just say "because I decided I want more"... but doesn't that suggest that I want more .... from him? (as usual)... Thats how he will interpret it.
MM, it's been quite awhile since I advised that. Your ex has shown by his behavior and statements since then that he is currently (and I and most of us here on your thread would contend, ever) incapable of being the one to give you more, so I wouldn't bother with this tack anymore.