Well yeah, it's very normal. You're growing up as a man and finding out what you truly want to be in life and your goals which might have seemed the best for you might not seem the most ideal. Don't force yourself to attempt to join the NBA because you used to want to, you might not want to now, so stay low, let yourself focus on other things. If your inner self really wants to be in the NBA, someday you will have that love for basketball again, but if it doesn't come to you then don't worry about it. Do what your heart is telling you to do, and that's not playing basketball. How old are you? If you're still in school, focus more on that rather than your relationship, it will help you discover what career do you want to follow and benefit you in the future, but you can still enjoy your relationship.