be not (one's) problem

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be not (one's) problem

To not be one's responsibility, duty, or concern; to not be something one cares about or intends to be involved with. I know you're worried about paying back your loan, but your financial issues are simply not my problem—you're the one who decided to get into debt. A: "But sir, there's no way we can satisfy the requirement if my husband isn't allowed to work here in the first place!" B: "That's not my problem, ma'am. Those are the rules."
See also: not, problem

ˌit’s/ˌthat’s not ˈmy problem

(spoken, informal) used to show that you do not care about somebody else’s difficulties: Well, I’m sorry you feel that way, but I’m afraid it’s not my problem.
See also: not, problem
References in periodicals archive ?
What they think of you isn't your problem, their opinions do not pay your bills.
This probably isn't your problem after 10 batches, but make sure the milk does not contain any colostrum.
Ultimately, for all the talk about sending messages to people who are positive, the real message of criminalization laws may be to everyone else: this troubling and complicated epidemic isn't your problem, it's that of monstrous outsiders who we can simply wall off from regular folks' lives.