My partner and I began dating in high school. I was unable to continue my education, but she could. We had a lot of communication when she was in level 100, but ever since she moved up to level 400, she has stopped responding to my texts, citing her final exams as the reason. I've been asking her about this abrupt change in behavior, but she won't talk to me about it even though she's finished, she still maintains the attitude. What should I do because I don't want to lose her?