Though you may think that the boy will only stay in love with you if he sees you every second of every day, the opposite is actually true. Your boy will be much more likely to stay in love with you if he sees that you have a life of your own, that you have some of your own friends, and that you're OK with just spending some time alone.  Don't try to have the exact same schedule as the boy. Keep up your sports, outside friends, and hobbies. If you drop everything just to be with him, then it'll look like you don't value your own goals very much. You and the boy don't have to have the exact same friends. Continue having "girl time" and let him have his "boy time" -- your relationship will be healthier if you don't spend all of your social time together. Stay busy. He'll want you more if he knows that your schedule isn't wide open and that you can't have him whenever you want. If you want the boy to stay interested, then you have to keep mixing it up. Don't do the same old thing every day or he'll begin to get tired of the same old routine. You should try to make the relationship always feel new and exciting no matter how long you've been together.  Pursue a new hobby together. Pick a new hobby to do together, whether it's learning how to make the best cupcakes in the world or becoming master golfers. If you do something new together every month, then your relationship will continue to feel new.  Discover new places together. Don't go to dinner at the same restaurant every Friday night. Find a new place to eat and keep things interesting. Go out of your comfort zones together. You should both do something that makes you feel squeamish -- whether it's learning to surf or conquering your fears of spiders. Find a new way to tell your boyfriend how much you love him. Don't just say "I love you" every time -- be creative when you tell him how you feel. If you're falling out of love, or not really feeling the love to begin with, then there's no point in forcing something that just isn't there. This will only make you...

TL;DR in Vietnamese:
Giữ sự độc lập. Giữ cho mọi thứ luôn tươi mới. Biết khi nào nên rút lui.