It depends on the situation, but here are some common signs: - she is suddenly very busy...especially Friday and Saturday nights. - your mutual friends are pushing you to date/move on - she is not very interested in getting back together Also, if she's part of any social networking site (myspace, facebook, etc), you may see a change in her profile. If all of your photos have been removed, her status is single and there are not comments pertaining to your relationship, she may be dating again.