If her friends and family don't like you, then they may eventually convince her that you're not good for her. Always act like a gentleman around her friends and family so that they'll encourage her to keep going out with you. You may not like them as much as she does, but you should make an effort to be nice because you care about her. Remember the names and some details about people important to her. Never make her feel like you'd rather be with your friends than be with her. At the same time, you need to have friendships with other people besides your girlfriend. Show that you have happiness and a social life also not all depending on her, that you are strong enough to be her support. Just make sure you strike a balance. Keep in mind that she could leave you, so you'd better work hard at keeping her happy so that you can keep her as your girlfriend. Make sure that she feels that she loses something great, if she would lose you. If you want to keep her, it's time to start treating her like a gentleman should. Don't expect a great girl to be available again…  Don't put your hobbies, video games, YouTube, music or other things you like before her. Never listen to music with headphones on when she's sitting there next to you, even if one earbud is out. If you have a duty of work or studies that disturbs, explain why and for how long. When she goes on a date with you, she doesn't go there so that you can play games on your iPhone and text your buddies. If you do things like that, she'll think you're rude and that you don't want to spend time with her, as any other person would think. After all, you can do that stuff as much as you'd like when she's not around. If she thinks you spend much time with less serious things, she can assume that you will not work hard for a good income later, but be a financial burden to her instead. Don't smother your girlfriend. You want her to be excited each time she sees or hears from you. If you smother her, she may become overwhelmed, which could ruin a good relationship. There...

TL;DR in Indonesian:
Berusahalah untuk mengenal teman-teman dan keluarganya. Seimbangkan waktu yang dihabiskan dengan teman-teman dan dengan pacar. Jangan pernah membiarkannya. Berikan ruang kepada satu sama lain. Bersedialah untuk berubah. Bersikaplah sensitif kepada pacar/teman kencan.