I think everyone's hit the nail on the head - he's feeling guilty and he's trying to keep you in his life. If he wanted to end it, you wouldn't have heard from him twice in as many weeks.
I saw a movie trailer yesterday where the main character told his friend that the last time he saw or heard from his dad was in 1978. His father loaded two suitcases in his car, told him "Bye" (he was about 10 at the time), got in his car and drove away. That was it. He never saw him again.
Seeing that really hit home for me. Cake eaters don't do that. They're cowards, they don't have the balls. No drawing a line in the sand, no burning bridges. Instead, they juggle balls and keep everyone topsy-turvy while they pursue the best of both worlds. It's VERY destructive to everyone involved.
You gotta hate that movie character's father. What a jerk! But at least you know where you stand and can move on. With a cake-eating WAS, you can't. They don't slam the door and lock it. They leave it ajar.
So yes, give your WH a brusque reply and tell him not to contact you again. If YOU lock the door on HIM, he's gonna panic and want back in...
