Aaron spent all of the following day at work thinking about his conversation with Keeley. She didn't seem angry. If he had to give it a word, he would say she seemed resigned.
Anger, resentment, or even bitterness would have made sense. But resignation? That didn't fit with what he knew about her feelings towards him.
Keeley didn't want him. She made that clear at every given opportunity. Acting resigned about the whole thing made it seem like she actually did want him around but feared the consequences too much to make it happen.
It didn't work with her whole 'I'll never forgive you; there's no going back' thing. She had said things like that multiple times.
'There's no going back' was practically her motto. She was determined to move forward and live her best life without him. So why the resignation?