It depends on what is important. Here is my "expert" input...
If you are very young (like 8th grade or something), don't bother with your girlfriend. It might sound harsh, but at that age, chances are you will find somebody way better in college. Continue your Basketball career and enjoy yourself.
If you are older (say, 11th grade), I still think you should focus on basketball, because you'll find somebody better in college.
Also, if your GF really "loves" you, she wont leave you for pursuing what you like to do. If she does leave you, she didn't really like you that much in my opinion.
Sig and Avy made my me!!!Brawl FC is 3394-4531-4018