Dictionary / Vocabulary / 愛想尽かし
あいそづかし
no longer being fond of someone; spiteful words or acts showing that one is disgusted with someone
Also written 愛想づかし、あいそ尽かし
あいつは優柔不断だから、彼女が愛想尽かしちゃったんだよ。
She got tired of his waffling and dumped him.