I just finished the episode where she invites Big to stay with her and Aidan in their cabin in the woods.
Now if my boyfriend cheated on me (not just a one off but had a full blown affair with a married woman) and we had got to the point where I had somehow managed to forgive him and we were trying again. If we went on a weekend break and he invited the other woman because she was having boyfriend problems and they were good friends - I'd think fuck that!
I know Aidan didnt have to put up with that but there are many other examples of her not having any redeeming qualities -
Berating Charlotte for not offering to lend her thousands of dollars.
Always talking about herself - I remember when Stanford called her out on it.
Letting Aidan propose to her when she obviously didnt want to marry him.