I actually was playing a female human noble that was romancing/loving Leliana, and i had an experience with Alistair that ended up with him dead.....
I had stayed on "friendly" terms with Alistair the whole game, as i was going to sacrifice my own character at the end in a blaze of glory. I never once picked a choice that would let him believe otherwise.
After finishing off Howe, getting Duncan's Shield, and giving it to him in camp, then making it past landsmeet, gotten him to agree to marry Ms. haughty(aka Anora.....although i must admit she's got the goods and knows how to flaunt them, ah, i may as well admit i'd rather have seen the threesome being my character, Leliana, and Anora....hmmm, there's nothing like a little blonde to go with two red heads:O) and all of a sudden....i get back to camp and he's all over my character like bedbugs in a run down inn's bedding.
He gives me the rose and initiates the attempt to "get intimate" with me. Not only do i have to turn him down, but then Leliana gets on my case, and i have to calm her down and let her know who's getting the lovin. That really made me mad.
We then get back to the castle, and he comes to visit me before we head to Denerim, and continues the begging. I let him down again.
He riled me so much, i then decided he would meet his end instead.
It also reminds me how fun Role playing really is, now that i think on it as well as how i need to toss in another "how much i love Bioware games" plug.