Can you use Mouse.Button1Down in a while true loop?

Im making a loop where it changes a parts position constantly until you click. However the click function happpens without me even clicking. Dont know why it does that.

Code looks something like this

Completed = false

while true do
    (Lots of other code here)
    while Completed == false do
        wait(.05)
        Mouse.Button1Down:connect(function()
            print("Mouse was clicked")
        end)
    end
end

Summary: While loop runs function even thought the mouse wasn't clicked. Any fixes?