Responses
She told Aurora they had their hearts broken by the same person. She initially liked Asa for his looks. She very clearly later developed feelings for him.
She also doesn’t really have a "problem"? She was slightly miffed, and reasonably so, and now she’s just been thinking it over. Asa asked for her blessing, so she’s thinking about it. She could’ve confronted Asa there and there, if she wanted to. Instead, she left, and she appears to be in deep thought more than anything else.
I guess this is done so the yearning feels more intense and the sex afterwards more rewarding, but what's Sarah's problem, for real. She had no feelings for Asa, she liked him because he's hot. It's just frustrating at this point