How do you know when your girl is seeing someone eles?

Signs that your girlfriend might be seeing someone else can include changes in her behavior, such as being less communicative, spending more time away from you, or being secretive about her phone and social media activities. You might notice inconsistencies in her stories or a lack of interest in your relationship. Trust your instincts, but it's essential to communicate openly and honestly with her about your concerns before jumping to conclusions.