I believe because she knew he was "coming home".BurningDoom wrote:
1. Thanos was shown hanging out with Death, and Death seemed to return the affection. The way I've always seen Thanos is pining after Death, hoping to win her affection, only to be scorned by her.
So when did Death accept Thanos as her consort?
I'll have to get back to you on your other two questions. It's been a while since I've read Annihilation.