Why does my program exit?!

Hi I was hoping that anyone could help me with this piece of code from
my program?! I have a menu with 2 submenus that you can reach from the
main menu. When I start the program I want the main menu to be presented
with a number of choices. My program is based on user input so naturally
when you enter the program you should be able to do the choices that are
presented in the menus. It worked before but now when I started adding
features for it(its for an assignment for a course) now it just presents
the menu and then exits the program. Can anyone help me with this. I
will post the code below and hopefully someone with more programming
skills than me can see the problem. Thanks!


    module Menus
  def self.getValidNumber
    input = gets.chomp

    while input > @options.size || input < 1 do
      puts "cant do that try again."
      input = gets.chomp
    end

    number = input.to_f
    if (number <= 0)
      puts "cant state a negative value."
      getValidPositiveNumber
    end
    return number
  end


  def self.get_valid_input(options)

    input = gets.chomp

    while (!options.include?(input) && !options.include?(input.to_i))
      puts "No good, you have to choose a value between " +
valid_options.inspect
      input = gets.chomp
    end
    return input

  end


  class Menu

    attr_reader :options

    # Pass in array of options
    def initialize(options)
      @options = options
    end

    def main_menu
      puts "---------------------------"
      puts "      Main Menu"
      @options.each_with_index do |item, i|
        puts "  #{i+1}. #{item}"
      end
      puts
      puts "What do you want to do?"
    end

    def self.make_choice(choice)
      # chooses something from the menu based on the choice
      case choice
      when 1
        check_in
      when 2
        check_out
      when 3
        puts $in_menu = lists_menu
      when 4
        puts $in_menu = economy_menu
      when 5
        puts "You are now leaving the camping, welcome back!"
        exit
      end
    end


  def lists_menu
    puts "---------------------------"
    puts "      List Menu"
    @options.each_with_index do |item, i|
      puts "  #{i+1}. #{item}"
    end
    puts
    puts "What do you want to do?"
  end

  def self.make_choice(choice)
    case choice
    when 1
      puts $camping
    when 2
      puts $camping.history.all_guests
    when 0
      $in_menu = main.menu
    end
  end

  def economy_menu
    puts "---------------------------"
    puts "      List Menu"
    @options.each_with_index do |item, i|
      puts "  #{i+1}. #{item}"
    end
    puts
    puts "What do you want to do?"
  end

  def self.make_choice(choice)
    case choice
    when 1
      $camping.economy.printCosts
    when 2
      $camping.economy.enterNewPrices
    when 3
      puts $camping.history
      puts $camping.economy
    when 0
      $in_menu = MAIN_MENU
    end
 end

m = Menus::Menu.new ["Checkin", "Checkout","Lists","Economy","Exit"]
m.main_menu
if Menus == 3 then m = Menus::Menu.new ["List current guests","List all
guests","back to main menu"]
m.lists_menu
elsif Menus == 4 then  m = Menus::Menu.new ["Price list","Edit price
list","back to main menu"]
m.economy_menu
end
end
end
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