Though you can't be selfless all the time, being selfless is an important part of being a good friend. Accommodate your friend's wishes whenever you can, provided this is done in a balanced way. Reciprocate his or her acts of kindness with caring deeds of your own, and your friendship will be strengthened. If you get a reputation for being selfish and only being around your friends when you need some help, then people will know you're not looking out for them.  Do a favor for your friend just out of the goodness of your heart, not because you want something in return. There's a difference between being selfless at the right time and letting people walk all over you. If you feel like you're always helping your friends and get nothing back, then you may have a problem. Don't abuse generosity or wear out your welcome. When your friend does something nice for you, reciprocate quickly. Return any money you borrow promptly. Go home when it seems like the time is right. Don't monopolize conversations, but rather take the time to truly understand and support your friend when they are talking to you. It sounds simple, but make sure you're listening as much as you're talking about yourself. If you're monopolizing every conversation with your feelings, your friend isn't getting anything out of the relationship. Listening opens space between the two of you and reassures your friend that you care.  If you're just waiting for your friend to finish talking so you can say what you want to say, it'll be obvious right away. Try to strike a balance of letting your friend talk about half of the time. Though some people are shyer than others, if your friend feels like they can't get a word in when they're around you, it'll be hard to have a healthy, two-sided friendship. If you accidentally interrupt, say something like, "Oh-I'm sorry, go on." To be truly supportive, you'll have to be able to watch out for your friends when they're having a tough time. If you sense that your friend is getting into some sort of trouble over which...

TL;DR in Vietnamese:
Vị tha. Biết lắng nghe. Giúp bạn bè đối mặt với khó khăn. Ở bên bạn bè trong giai đoạn khủng hoảng. Đưa ra lời khuyên thấu đáo. Cho bạn bè không gian riêng khi họ cần.