Script taking ModuleScript's Functions as it's own?

I am making a moduel script to tween weld's C0 and C1 but I am making a breaker as well the problem is when I call the function thru a script it wont let me call anything till the module script's function is done running. Any way to fix this?

here is the Module Script's code

local tween = {}

function ifweld(obj)
	if obj.ClassName == "Weld" or obj.ClassName == "Motor"
		then
		print("Tweenable Object")
		return true
	else
		print("Untweenable Object")
	end
end


tween.StopTween = function(weld)
	print("Function StopTween Called")
	check = ifweld(weld)
	if check == true
		then
		if weld:FindFirstChild("Tween") ~= nil
			then
			weld:FindFirstChild("Tween"):remove()
			print("Stopped Tween")
		end
	end
	print("Function StopTween Ended")
end

tween.Tween = function(weld,C0,C1,dur)
	local prints = 0
	prints = tostring(prints+1)
	print("--["..prints.." Function Tween Called")
	check = ifweld(weld)
	if check == true
		then
		if weld:FindFirstChild("Tween") ~= nil
			then
			prints = prints+1
			print(tostring(prints).." Running tween prevented called tween")
		end
		if weld:FindFirstChild("Tween") == nil
			then
			prints = prints+1
			print(tostring(prints).." Availible")
			local breaker = Instance.new("StringValue")
			breaker.Name = "Tween"
			breaker.Value = "Tween Breaker"
			breaker.Parent = weld
			--
			for i = 1, 100 do
				wait(1)
				if weld:FindFirstChild("Tween") ~= nil
					then
					print("Found")
				else
					print("Not Found")
					break
				end
			end
			--
		end
	end
	prints = prints+1
	print(print("--["..prints.." Tween Ended]--"))
end

return tween

here is the Script's code

local tween = require(script.Parent.WeldTweener)

tween.Tween(script.Parent.Part2.Weld)
wait(.5)
print("Stopped")

the break work's if the stop function is called out of the script that called the tween also.