Can anyone remind me why aiden had to leave 9 years ago? Or was it not specified the reaso...

Because of his family, his dad or grandpa was brother to the king, so because of that they had to go hack to their territory as to not enter into conflict with the royal family, I think, I'm not sure, from what I remember that's what I understood, but he could have just sent a letter explaining what was happening before actually stop sending the letters, but he didn't, so he had no concern for her feelings which is why she was so hurt and with time stopped loving him and got over her live for him