How can I break the loop while it is still running through another function?

Thank you for reading my question and considering helping me. To begin with I will tell you what I have been doing and what the objective is, I am using a loop to make a part grow until it reaches a maximum pre-established size and then start to decrease until it reaches a minimum pre-established size. This part of the code is working just fine.

The problematic part is stopping the loop, to do that I made a variable that needs to be true for the loop to run, so I did a touched function so that when I touched the part this variable becomes false and then the part would theoretically stop growing / decreasing, and in fact it kinda works, but the touched function waits for the loop to end for this to happen, that is, it waits until the part returns to the smallest possible size and only then stop the loop, which is not what I wanted, I want the part to stop the loop immediately when it is touched, staying at the size it was at the time of contact. What I have so far is this:

local Players = game:GetService("Players")

local GrowingPart = script.Parent

local grow = true

local MaximumSize = Vector3.new(8, 12, 8)
local MinimumSize = Vector3.new(8, 1, 8)

GrowingPart.Touched:Connect(function(Hit)
	local Player = Players:GetPlayerFromCharacter(Hit.Parent)
	if Player then
		grow = false
	end
end)

while grow do

repeat
GrowingPart.Size = GrowingPart.Size + Vector3.new(0, 1, 0)
GrowingPart.Position = GrowingPart.Position + Vector3.new(0, 1 / 2, 0)
wait(1)
until GrowingPart.Size == MaximumSize

repeat
GrowingPart.Size = GrowingPart.Size - Vector3.new(0, 1, 0)
GrowingPart.Position = GrowingPart.Position - Vector3.new(0, 1 / 2, 0)
wait(1)
until GrowingPart.Size == MinimumSize
	
end

while grow do only ensures that the while loop stops, you have 2 more loops which you also need to stop, to fix that for your case, you need to check in both repeat loops if grow is true, you would use or operator which does what it sounds like.

...
repeat
	GrowingPart.Size = GrowingPart.Size + Vector3.new(0, 1, 0)
	GrowingPart.Position = GrowingPart.Position + Vector3.new(0, 1 / 2, 0)
	wait(1)
	--/If grow becomes false, it will stop
until GrowingPart.Size == MaximumSize or (grow == false)

if not (grow) then
	--/Breaks the while loop preventing next repeat loop from
	--\from running, only breaks if [grow] is false
	break
end

repeat
	--/This is also a possible method
	if not (grow) then
		break
	end

	GrowingPart.Size = GrowingPart.Size - Vector3.new(0, 1, 0)
	GrowingPart.Position = GrowingPart.Position - Vector3.new(0, 1 / 2, 0)
	wait(1)
until GrowingPart.Size == MinimumSize
...

If you still did not understand the or operator, here is simple explanation, it checks if statement before or or statement after it are true, if at least one of them is, it passes.

This should work however, you can use TweenService too! In my opinion it's a lot smoother and you can destroy tweens so if change your mechanics a bit, you can make an awesome script. You don't need to do, just optional.