: not something one is responsible for or involved in Her affairs are not my concern.

What does its not your concern mean?

From Longman Dictionary of Contemporary Englishnot somebody's concern/none of somebody's concernnot somebody's concern/none of somebody's concernif something is not your concern, you are not interested in it and you do not need to worry about it or become involved in it His affairs were none of her concern.

Do not concern me meaning?

that doesn't really concern me: that's not anything to do with me, that isn't important or interesting to me.