I'm sorry to hear that you're feeling this way. It's natural to feel worried about losing someone you care about, but it's also important to remember that nothing is set in stone. Here are some signs that may indicate you've lost someone and they may not come back:

1. **Lack of communication**: If she has been avoiding you or not responding to your messages or calls, this could be a sign that she is moving on.

2. **Emotional distance**: If she seems emotionally distant or uninterested in spending time with you, it could be a sign that she has checked out of the relationship.

3. **Changes in behavior**: If she has started behaving differently or seems to have lost interest in things that she used to enjoy with you, it could be a sign that she is moving on.

4. **Blatant disinterest**: If she has told you directly that she doesn't want to be in a relationship with you anymore, it's important to respect her decision and give her the space she needs.

While these signs may indicate that she is not interested in rekindling the relationship, it's important to remember that people can change their minds and circumstances can shift. If you still want to try to mend things with her, it's important to communicate openly and honestly, listen to her perspective, and give her the space and time she needs. Ultimately, remember that you deserve to be with someone who wants to be with you just as much as you want to be with them.