How do you know your girlfriend does not love you anymore?

Test her. It's good to be honest and sit her down for a talk or something. It really depends on if you guys are used to each other. If you can be open to her and ask her anything then come straight forward and ask her. If your kind of shy on the topic ask her about your relationship,look straight into her eyes and tell her you love her. Usually you can tell by the reaction in her eyes because someone you are in a relationship with won't keep a straight face unless they answer from their heart when you ask a question like this.

Omg are you kathleen or cara ?