Obviously Frostfire is upset with his mother for what she did to him. But in Windborn it seemed like he had a change of heart and sided with Star, even helping him discover his invisibility powers. But later you find out that he betrays Star by telling Petalcloud about the tunnel and helping her capture Morningleaf. When he did this, did he forgive his mother, or was he still furious with her just willing to work with her because Star couldn’t set Starfrost free? I personally am really not sure but other opinions might help answer this question >:)