If you love this woman, keep her and don't let her slip away from your world. You should cheer up and tell her what you think bravely, or you will regret that she left, and you will regret that you didn't keep her when she left. If you do, she won't want to stay. That's her business, you won't regret the decision you make now! People should not let themselves do things they regret, or they will regret it all their lives!