Now I began my insanity run and I remember what I choose when I see again the questions, I had a Male Shepard so the game give me 3 options "Ashley" "Liara" and "the mission comes first" so I remember that I didn't like any of the 2 and I choose the mission =P... So, according to that I didn't pick anyone in the first ME, choose hot Miranda in ME2 so I shouldn't have any problems in ME3 =P
I had my doubts about Miranda towards the end of the game, I didn't know if she was the right option and I began to regret my decision, but after the final fight, when the Illusive Man orders Miranda to stop Shepard about destroying the Collector Base and she quits Cerberus without a doubt... I fall in love with her <3