Commitment

Sometimes I wonder what is true love?
I've seen lots of examples of love, where it doesn't really sound like love to me. I see how each couple interact, I see how they hurt each other, how they make each others' lives happy... I see how they may break up. For what? at the cost of what? Well, this entry isn't about my commitment, it's some pondering after hearing some news from my family and whatever is going on with that family member.
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A girl is being asked to marry her 4 year+ long-distance boyfriend but not because he asked, because his parents and her parents asked. Do we expect them to get married simply because Chinese culture says so? Would this marriage be happy and faithful? I absolutely love the girl and want her to have the best in everything, but in this case, even I can't help her. She's stuck in this transition of career and love. If career only comes because of love... is it even a true self-earned success? I don't honestly know what is going on but I can only hear so much information. She's too upset to talk to me right now, she told me "everything is fine, don't worry," but she said that with a sadness in her voice. I know she's been crying, I can tell but what can I do? Let her have her quiet time, let her think it through. Even if I was beside her, would she let me help her? I can only communicate with these people through a modern technology that isn't so modern anymore, a telephone, or better yet, digital phone - skype. I wish and hope everything works out for the best, the best of everyone. Also, I really hope that she would come to me first before I have to hear it from a third person. To think, I am her younger sister after all.