I don't get girls sometimes (Girls need your help on this one)?

well, maybe your girlfriend was in a bad relationship before this and now she does not want the same thing again. but you have been honest and there is not really anything you can do but be honest. and i know you probably think it is stupid, but couples get in these fights all the time, if you still want to be in a relationship with her you need to pull yourself together and go and say sorry. the reason it seems you got into a bigger fight is because you got aggravated that she didnt believe you so you got angry. Just stay calm and tell her you are sorry for how you acted but you were telling the truth, and make what you did in the first place sound insignificant and then apologize for doing it. and say that it was before you were going out with her and you were just bored so you did it