Can you still romance Ashley 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.
What happens if you cheat on Liara in ME2?
This seems to have no effect on Liara later on, and Shepard can continue onto Mass Effect 3 to romance her, however, Shepard will be forced to choose between their love interests during the third game. Breaking up with certain characters in Mass Effect 3 can significantly impact their stories for the worse.