Thanks for your question. I think, first of all, you need to know girls are very shy. They don’t like to share their feelings with others. But in your case, it is more difficult because someone cheats this girl. So, she did not trust anybody. So, the first thing you have to do. You have to make her believe that you won’t cheat her. You have to show your positive before her. So that, she can realize that you are not bad. You can take care her. You also can do one thing.If this plan does not work. The second plan is you have to act like you ignore her. Then she will think  about you. After some days if you found no changes. Go with my first plan. After two or three months, you should again propose her.  If she agrees then enjoy a happy life with your girlfriend. If she does not agree, don’t feel sorry. Then you have to think she is not for you, you deserve better than this.