You're going to have dig a little deeper and try to understand what caused her sudden change of heart. Often, unless the person has commitment issues and is always looking for a way out of the relationship, thoughts of not working out usually don't develop overnight and have larger underlying issues tied to it, just that the other party may not have brought it up. Your chances are dependent on what this underlying issue is, and whether its something that can be resolved or not to win her back.
Remember; do not talk about the relationship during this date. Just talk about the things going on in your life and ask them about their life. And you actually have to have something going on in your life to talk about. You cannot tell them how you spend all night yesterday watching reruns of Jersey Shore in your bed. This is another reason why completing Step 2 is so important.
Let your ex see you having a great time without him. After enough time has passed and you feel that you both got some perspective, you should start giving your ex the opportunity to see you having a great time. Starting going to the parties where he goes, or run into him with a friend at his favorite coffee shop or bar. Don't be too obvious about it, but let him see you with your other friends and remember how much fun it is to hang out with you.
Hi I met this girl at work and we started dating for like 6 months she said she love me so much and she feels so comfortable and very happy with me and I felt the same way too, everything about us was good. We planned of living together and our future too, suddenly I just knew that she has a boyfriend for almost 3 years now. Few days ago she told me that she don’t wanna continue dating me bcos of her boyfriend. I really don’t know what to do at this time I really love her. I wanna know what should I do in this kind of situation?