uhm, i have uttered the words 'i hate you' so many times--he knows i never mean it. never. EVER. i actually mean the exact effing opposite. so, although some things that have been brought up here are quite to the point, don't forget the dynamics and norms of X relationship, D/s or otherwise. sometimes what one feels in their heart is perceived to be [by them] unacceptable, therefore is never mentioned, or, in some other cases, things are left unspoken just because there is no need nor want for them to be told.

--obviously you're referring to something more serious rathen than a typical phrase thrown at a Dom's face under x,y,z circumstances. as for the first questions, here's my completely subjective and probably wrong approach to it, but what the heck:
stay just because i feel i owe it to my Dom? yes. definitely. for ef's sake, i do that in any kind of relationship, there are several people whom i wish i had broken contact off with years ago, but i didn't. nonetheless, i knew what i got myself into when i kept allowing them in my life. it was a conscious [and, in hindsight, a silly] reason. Would i do it again? yes, i'm sorry, but i would. i might hate myself for it, but i know that i'd hate myself much, much more if i left. i'm not saying i would be selfish, i'm just sayind i would feel like it, which, in my books, is worse.
as for the rest, well, you've repeated you've got your mind made up, so i'm just typing for my sake here, just to get this thought kinda wrapped up in here. it might be a gender thing, it might be a role thing, it might be a personality thing--it's all the above that determine what you say and do to some degree.
pff, i've wondered off topic, probably, and i'm more confused than i was before i started typing; my mind started giving me other options i need to look into before i type anything more hastily.