Can't figure out how to end this script?

This script continues to run more than once after it is first initiated and I can't figure out how to stop it. I don't understand why once it completes each function it doesn't end like its supposed to. I tried this myself but couldn't figure it out, any ideas? let me know if you need me to clarify anything

local BUTTON = script.Parent
local player = game.Players.LocalPlayer
local CURRENT = nil
local mouse = player:GetMouse()
local RANGE = 15


function do_remove_all(parent)
    local children = parent:GetChildren()

    for index, child in pairs(children) do
        child:remove()
    end
end

function rangeCheck(mouse)
    local char = player.Character
    local torso = char.Torso

    return (torso.Position - mouse.hit.p).magnitude < RANGE
end



function removeExample()
    local player = game.Players.LocalPlayer
    local char = player.Character

    local ex_check = char:findFirstChild("BACKPACK_EXAMPLE")

    if ex_check ~= nil then
        ex_check:remove()
    end
end

function onGuiClick(part)
    CURRENT = part
end


function onMouseMove(mouse)
    local player = game.Players.LocalPlayer
    local char = player.Character
    local torso = char.Torso
    local pack = player:findFirstChild("Pack")
local pack_tab = pack:GetChildren()
local partname = BUTTON.Text
local part = pack:FindFirstChild(partname)

    removeExample()


        if rangeCheck(mouse) then

            local example = part:Clone()
            example.Name = "BACKPACK_EXAMPLE"
            example.Locked = true
            example.Transparency = 0.5
            example.Parent = char
            example.Position = mouse.hit.p
            do_remove_all(example)

        end
    end


function onButton1Down(mouse)
    local pack = player:findFirstChild("Pack")
local pack_tab = pack:GetChildren()
local partname = BUTTON.Text
local part = pack:FindFirstChild(partname)
local player = game.Players.LocalPlayer
local char = player.Character
local example = char:FindFirstChild("example")

    if part ~= nil then
        if rangeCheck(mouse) then
            removeExample()
            print("clicked")

            part.Parent = game.Workspace
            part.Locked = false
            part.Anchored = false
            part.Position = mouse.hit.p

            part = nil

            --  repeat wait() until MouseButton1Down    I'm trying something like this but don't know how to phrase it
    end
    end
    end

function onKeyDown(key, mouse)
    if key == "r" then
        removeExample()
        local CURRENT = nil
    elseif key == "e" then
        local player = game.Players.LocalPlayer
        local pack = player:findFirstChild("Pack")
        local pack_tab = pack:GetChildren()

        for index, child in pairs(pack_tab) do
            local CURRENT = child
            onButton1Down(mouse)
            wait(0.1)
        end

        local CURRENT = nil
    end
end

function onMouseButton1Down()

        print("buttonclicked")
    mouse.Button1Down:connect(function() onButton1Down(mouse) end)
    mouse.Move:connect(function() onMouseMove(mouse) end)
    mouse.KeyDown:connect(function(key) onKeyDown(key, mouse) end)

end

BUTTON.MouseButton1Down:connect(onMouseButton1Down)