sometimes girls can be really insecure at times... maybe your girlfriend had relationship problems in the past and she's being so cautious which leads her to act this way... my advice to you is sit down and talk to her... let her know exactly what you said, and how you feel, and to trust you... its hard not to believe someone when they are speaking from the heart... give her time, she may not come around right away, but you reassuring her about how you feel will help her. but if she does not change her attitude then maybe its best for you to reevaluate how you're going to spend your time. there's nothing worse than being with someone who doesn't believe in you. relationships are built on trust, that's what you need. but all in all, have a talk with your girlfriend, and try to work things out, trust me you'll feel better about it feel free to return the advice...