Yes! I agree with both posters!
The mantra you NEED to keep repeating to yourself is
APPLY EARLY
If you are not an extraordinary applicant, but competitive enough to get accepted. You have a better chance when there are more open seats than towards the middle/end of the application cycle.
Seriously, your friend *should* understand. It's an engagement, not the actual wedding.
As my friends and family have told me whenever I had a conflict either during the application or studying portion of trying to get into school, they simply kept telling me, "Do whatever it is you have to do. Don't let anything get in your way. Prioritize." This helped minimize the guilt that comeswith being selfish. You HAVE to be selfish about trying to get into school, all within reason, of course.