Same here Jill, If this can happen to my H and me it really can happen to anyone. Like you I NEVER ever thought it would happen to me/us, that he fell out of love with me blows my mind not because I consider myself some prize but what we had was so strong for so long.
You talk like you've already read "love busters" with your referrals to your H being emotionally empty and not full. That is precisely what that book is about and how to keep them full. I found my copy at a used book store. Good Luck, Lisa