Start losing friends

Yes, I am start losing my best friend. She is in Faculty of Pharmacy and always have her free time. In the other hands, I was always busy with my exams and loads of group discussions... Ya, we are getting further and further. It's true wats Dr. Hamidah told, "Taking medic, u will start losing ur friends (from other faculty) because they can always enjoy their outing but u don't..". She always ask me to join her but it's hard..our timetable are different. Very sorry to her but hopefully she can understand my situation..If no, then the relationship is getting more and more brittle...