「わかりあえない」 I can guess that it is: Don't find understanding. But I'm not sure in it due あえない I tried to find the answer and I met the verb 会える. But I could not find the word in the dictionary. I guess it's almost the same as that 会う Thanks for your help!
わかりあえない is a negative potential form of わかりあう (分かり合う）
わかりあう：To understand each other / to comprehend
わかりあえる：(potential form) Able to understand each other / comprehend
わかりあえない : (negative-potential form) Not Able to understand each other / comprehend