Can you romance Ashley in me3 if you romanced Miranda?

If you were Loyal to her and didnt Romance anybody in Mass Effect 2, youll be able to reaffirm that you still love her, or be more reluctant. If you werent and Romanced Tali, Miranda or Jack, youll have the option to choose Ashley over them.

Can I romance Miranda and Ashley in Mass Effect 3?

Yes. Absolutely do this. Do not go to Ashleys lock-in point until after you have had all three conversations with Miranda. You should meet with Ashley first, lock-in her romance and then meet with Miranda.

Can I romance Liara and Miranda?

To continue a romance with Miranda, you must import a ME2 save file in which the two of you had a relationship. When you reunite, you can reaffirm your relationship, and then meet in a private room for an intimate conversation.