@KiTA Your comment made me finally realize what happened.
She was greeting him, her friend thought she was greeting her, and that made him think she greeted her as well, which made her mad right after he left her there greeting her friend.
Ooff.. That was a tough one.
Somehow ended up here after reading to almost the latest chapter of The Dangers in My Heart, and tried to look for something similar in my "Plan to read" bin. Not nearly as good as the former, but I guess it'll work.
It's weird when you read this again and realised she has gone as far as sitting on his lap in the second chapter only to be embarrassed by little things as the story progrees