Why wont my script turn off when I change the variable?

So im making a script for a game and im new so i dont know this stuff but when i try to turn off my script instead of turning off it prints the turn off message but does not turn off can someone tell me why (@T3_MasterGamer help pls)

local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
 local on = false
script.Parent.MouseButton1Click:Connect(function()
    if on == false then
        print("turning on")
        repeat 
            wait(1)
             on = true
            local part2 = Instance.new("Part", workspace)
            part2.CanCollide = false
            part2.Anchored = true
            part2:PivotTo(character:WaitForChild("Head"):GetPivot() * CFrame.new(0, 0, 10))
            part2.Name = "Part1"

            character:WaitForChild("Humanoid"):MoveTo(part2.Position, part2)

        until on == false
    else 
        on = false
        print("Turning off :(")
        game.Workspace:WaitForChild("Part2"):Destroy()
        script.Parent:Destroy()
    end
end)