How to Stop a Function from being Looped?

So I'm trying to get out of a Function that continues to run. I have tried to work around it by making an "if then end" but since it's not updating the state of that variable once the variable is "true" (let's say) it continues the function within the "if then" even when later that variable to set to "false", it doesn't read an update. I'm sure there is a way to do this but not sure.

TL;DR I'm not sure how to say "if this variable == false at ANY POINT stop running this function"

Code I'm Working With (I know it's messy oops)

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-- Ignore the fact some variables are missing....don't feel like making this longer than it already is
local _check = true

function mouseMove()
    local posX, posY, posZ = mouse.Hit.X,mouse.Hit.Y,mouse.Hit.Z
    Preview.Position = Vector3.new(posX,posY,posZ)
    print ("Im Still Running") -- THIS IS PROVING THAT FUNCTION NEVER STOPS
    mouse.Button1Down:connect(function()
        print("BOOP")
        ply.Items.Oof.Value = false
        _clone.Position = Preview.Position
        script.Parent.Parent.Parent.ScreenGui.MyButton["De 1"].ItemName.Text = ""
        _check = false
        Preview:Destroy()
    end)
end


if ply.Items.Oof.Changed:connect(function()
    if ply.Items.Oof.Value == true then
        game:GetService("UserInputService").InputBegan:connect(function(_inOb,gameProcessedEvent)       
            if _inOb.KeyCode == Enum.KeyCode.One then
                _check = true
                if _check ~= false then
                    mouse.Move:connect(mouseMove) --Once line Get's here it runs above function every mouse movement, this is the issue. Somehow it get's here when I set _check = false
                end 
            end 
        end)
    end
end)
then end

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