Your mom doesn't win in this situation. You do. You get to continue to be co-dependent and abdicate responsibility for your life and your decisions by blaming your mom. You get the payoff of being the victim. You get the payoff of not having to take any risks, make any changes, or do anything new or scary-- and then blame your mom. If you want to stay where you are at, then that is your right. You don't have to grow up, have your own place, or have a girlfriend if you don't want to. It's your life and you are the one making decisions. Not your mom or anyone else.

Before, you said that you made the wrong decision when you chose your mom over your GF. However, you just chose your mom over your GF again. Your mom is not the only one who is over-attached or co-dependent here. You both are. You are both participating in the dysfunction.

If you want help, seek out therapy. Figure out why you are participating in this and choosing an unhealthy partnership with your mom over independence or a real, adult relationship. If you don't want to change this, then do exactly what you are doing and own it as your decision. Your mom is not "making you" do anything. These are your choices.