It can be a little tricky to make friends with boys when you’re only eleven, but it’s important to try to be nice to the boy’s friends if you want to make his affection last. You don’t have to be best friends with his friends, but you should at least be friendly and kind, so that they have nice things to say to him about you. If you come off as standoffish or mean, then they’ll try to tell the boy not to hang out with you, and some boys tend to listen to their friends at that age.  When you see his friends, say “hi” and ask how they’re doing. Get to know them a little bit to show that you really care about their friend. If you don’t like one of his friends, don’t tell him that. It’ll only cause a rift between you. Since you’re only eleven, you don’t need to think about getting too intimate with the boy. Still, some light affection can help your relationship stay strong. You can hold hands, whether you’re walking together or watching a movie. You can give him a hug when you see him, or even have him put his arm around you if you’re hanging out together. Just a little bit of affection can go a long way in keeping your relationship strong. Just remember that a lot of eleven-year-old boys aren’t into publicly showing affection, even if they like somebody a lot. Start slow with showing affection publicly and see what he’s comfortable with. You may see hearts, rainbows, and butterflies whenever you lay eyes on the boy, but you may want to keep that to yourself. You should let him know you like him without saying that you think you want to marry him and that you’re totally in love with him, or you’ll be scaring him off a bit. Remember that, when you’re eleven, it’s important to keep the relationship light and fun instead of getting intense too soon. This is good advice, in fact, for the beginning of any relationship at any age! You can write him notes to say hi and to tell him that you’re thinking of him. However, you don’t have to feel compelled to tell him the fifty things you like the most about him. You should...

TL;DR in Indonesian:
Bersikaplah ramah dengan teman-temannya. Tunjukkan kasih sayang kepadanya. Janganlah melimpahkan perasaan yang terlalu berlebihan kepadanya. Jangan berikan terlalu banyak tekanan pada hubungan Anda. Selalu luangkan waktu untuk teman-teman Anda. Temukanlah hal-hal baru untuk dilakukan bersama.