It’s a simple fact that showing commitment to your ex girlfriend is how to get your ex girlfriend back. Whether you commit to dating only her or become engaged, your ex girlfriend will surely see that you now are willing to be in a serious relationship.  If this was the problem that broke you up then you committing and assuring her of your undying love will sooth all wounds.  You will be on your way to a wonderful relationship.  A woman does not want to be taken for granted and committing to her will bring back her love for you.