jmdict 2262990 Active (id#2090888)
こっちの話
【 こっちのはなし 】
  1. [exp] [col]
    • matter being discussed (e.g. in a private conversation)
    • it's not your business
    • it doesn't matter (to you)
    • it's a private matter
    Cross references:
    • ⇒ see: 2100860 こちらの話 1. matter being discussed (e.g. in a private conversation)
  2. [exp]
    • our side of the story (in contrast to another's version)
History:
    • A 2020-12-30 20:31:51 Jim Breen
    • A* 2020-12-30 14:52:08
    • Diff
      @@ -16,0 +17 @@
+<gloss>it's a private matter</gloss>
    • A 2020-12-30 07:22:30 Jim Breen
    • Comments
      Softening a little.
    • Diff
      @@ -15 +15 @@
-<gloss>none of your business</gloss>
+<gloss>it's not your business</gloss>
    • A* 2020-12-30 01:01:06 Alan Cheng
    • Comments
      I do admit that "none of your business" sounds harsher in English to me than こっちの話 comes off in Japanese, though.

Also, the original gloss "talking to oneself" can work as a translation for this term in some contexts, but it probably doesn't fit as a dictionary gloss. Here's an example:
どうしよー…　あっ、こっちの話だから、気にしないで！
What to do... Oh, I'm just talking to myself, don't mind me!
    • A* 2020-12-30 00:51:46 Alan Cheng
    • Comments
      I suspect my addition is related to what was discussed back in 2012, but these are the glosses that I found useful. "matter being discussed" isn't the most enlightening gloss when you encounter こっちの話 being used on its own.
    • Refs
      jitsuyo
https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1173465096
https://hinative.com/ja/questions/1539897
いや、こっちの話です (斎藤和英大辞典)
It is neither here nor there.
    • Diff
      @@ -14,0 +15,2 @@
+<gloss>none of your business</gloss>
+<gloss>it doesn't matter (to you)</gloss>
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