Detect if a textbutton is being held?

Hello, im making a cannon script where you can control it from a gui, but there is a problem, when i want to rotate i made it so you can hold it and it keeps rotating but it just does it once I tried this

local touching = false


script.Parent.MouseButton1Click:Connect(function()
    touching = true
    coroutine.resume(coroutine.create(function()
    repeat
        script.Parent.Parent.fire:FireServer("rotate","left")
        wait(0.1)
    until touching == false
    end))
end)
script.Parent.MouseButton1Up:Connect(function()
    touching = false
end)

What could i do to fix this problem?