Can someone tell me how to make the billboard gui disable itself after something ?

so i made a script right here

     function onTouched(hit)  --when the brick is touched activate--
          H = hit.Parent:FindFirstChild("Humanoid") --see if the thing that touched the brick is a humanoid--
               if H ~= nil then  --if it has a humanoid--
               script.Parent.BillboardGui.Enabled = true  --remove it--
          wait(.001)  --wait a few milliseconds(to prevent lag)--
     end  --end the process--
end  --end the process(if u know how to script you will know why i have 2 ends)--


script.Parent.touched:connect(onTouched)  --make sure it works--

but i cant figure out how to make the billboard gui to disable itself after the humanoid that was currently on it walks out of the brick, can someone help me

Hello Cioss_Team! To do this we will use .Touched and .TouchEnded! Lets begin

part = --INSTANCE of part that will detect the touch
GUI = --INSTANCE of GUI that will be shown on touch

part.Touched:Connect(function(obj) --Detecting the touch
	if not obj.Parent:FindFirstChild("Humanoid") then return end --Making sure its a player
	GUI.Enabled = true  --Enabling the UI
end)

part.TouchEnded:Connect(function(obj)
	if not obj.Parent:FindFirstChild("Humanoid") then return end
	GUI.Enabled = false
end)

With any further questions/comments/concerns, feel free to reply to my answer. Happy scripting! ~mc3334