It's not you Isabella it's me... well mostly you.
Sure you betrayed me in the Fade, thats fine, everyone did. So you stole a precious relic of the Qunari that prevents them from returning home, happens to all of us! So you back-stabbed me and left with said relic and pretty much started a big old bloody war in Kirkwell, I ain't mad.
...But that Saw joke you made back in the hangman was the most unforgivable thing you have ever said to me and you should feel bad for telling such an awful joke.
...No hard feelings?