what should i do ?

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I have a friend.we become friends for a long time.but we are not coming a same country.As you know in my country we just speak Chinese.but she come form another country.and of course,our culture is different.And i think i have fallen love with her but i do not want to tell her until i am 100% sure that it is the right thing. i need help on culture difference.... what his parent might think and every thing she care for me almost like a brother she is always been there for me do you think its even right for me start a relationship with a really good friend.