Okay, so on this last play through I am a female elf who eventually hooked up with Alistair out of my weakness of not being able to resist his cute courtship and proposition of me and him in my tent near the end of the game. Even after turning him down the first couple of times and romping around with Zevran for awhile. (Romantic sucker that I am). I decided not to make him king but keeping both of us Grey Wardens and of course not having him do the dark promise with Morrigan.
So I decided to do the self sacrifice option in this game with me doing the final blow, and go out with a bang. However I most rudely discovered that Alistair said he was going to do it as he was not going to let me die (I actually called him a bastard and an SOB in the process several times over

). I think I have tried just about every dialog option to stop him but nothing seems to work. Has anyone been in this situation before and know a way to stop him? Do I need to break up with him before we hit the rooftop? That is where my game is saved to start if I wish to play again and I have the feeling that unless we are not romantically involved this how this scenario will always turn out.
Even though I did not make him king, the dialogue options and him keep talking referring to his kingship. Or I just might throw in the towel keep the play through this way and try again.
P.S. I just found out something interesting on another post I did not realize that I could Alistair at the gate? Hmmmm.....he can't deny me my death then relationship or not.

Oh, and I play on the Xbox 360 system by the way in case that makes a difference. Any comments or thoughts welcome