What's kind of that friend?

1. I just wonder what a friend supposes to be. 
Why are they so selfish that way? Money cannot buy everything. Money cannot buy the way I treat them so well. Money cannot buy my belief in them. And the investment in friendship is the worthiest. Investment is not meant to be money, not meant to buy them so many things, not meant "I give you one thing, then you have to give me something equally" fact. Investment meant to be the way we think of each other, we care of each other from the bottom of heart without any affected manners.

I came here, and made friends with new students. And 7 months living here makes me frustrated, exhausted and disappointed. That is not about study pressure because I can handle it well (at least until now), that's about the way people treat each other, the way people respect each other. But I never ask them to give anything back to me, never! I just treat them the best I can, although I know they are just friends as many other people and that friendship is not kinda close. I ask them if they need help, I hug them when they get hurt, I share them my food when they get hungry, I listen to them when they feel sad and even when they drunk and they don't know what they are talking about.
 Why do they have to destroy that relation right after my attempt at building it up? Why and why?
Should I just live for myself but nobody else? It hurts, honestly! Hurt because my belief in friendship is somehow collapsed and I don't know how to take it back with me little by little.
What doesn't kill me make me stronger, and now I am stronger than ever. And you know what, if someday they think they need me, they should not turn around to find me, because when they decided to break something, they should know they couldn't heal it as perfect as the first day.
2. Lucky fate. 
Many people ask me day by day: "Are you lesbians, You and Minh?" What the fuck they are talking about? We are friends, who are more than friends, who are closest friends.
They envy.
They are jealous.
Just because they never have a friend like that. And I have one and more than one. That's my lucky fate.
They all now are not here. But I still feel their appearances when they send me message, when they try to wipe my tears when I cry just by a meaningful song, they give me appointment for next year. Even when I am sick, they try to care of me as though I was in Vietnam. Their letters always make me day.
I keep all of them in my box, read through all of them every week...
Don't ask me how I can keep in touch with my friends, don't ask me how to build up a relationship and keep it strong that way as though distance can not ruin anything. Ask yourself if you try your best to maintain it or you just think that friends are just friends who are not the same flesh and blood, and friendship is not worthy wasting time.
3. Thank you my beloved friends, who still remember me. I miss you all, and I will meet you soon.
Not until the day you go so so far away from your beloved people, you know how important they are in your life.