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What are points of feeling happy if one got engaged in arranged marriage?

I really don;t understand the points why people become so much enthusiastic and feeling so much happiness if one got engaged with other? Even i don;t understand the points of happiness if one got engaged in arranged marriage? - You barely know the girl? So why people feel happy?

Public Comments

1. As I understand it, in an arranged marriage, you meet the girl first and spend time (even if not much) getting to know her. If you don't like her, you tell your parents, next! and that's that.
2. many people feel happy simply having someone to spend their life with.