Whom to spend time with?

If you have a best friend whom you value above all and a girlfriend whom you love a lot, it's your birthday, and this is the first and only year you can spend it with your best friend (since you both are from very different places and there is a high chance you may never meet again in life). On the other hand, you spend every birthday with your girlfriend and can be with her whenever you want.

Whom would you choose to spend your birthday with?