she is upset because you don't think of her only you and partying with your friends and she probs feels she is last on the list when it comes to you and you didn't nothing in those texts to make her see it differently. looks like you don't enjoy spending time with her that is why she is upset. try putting her 1st for once. the car thing looked bogus like an excuse was it because it was clear she saw it as a lie from you.
When I tell the truth, it is not for the sake of convincing those who do not know it, but for the sake of defending those that do.
William Blake