How a guy knows that a girl loves him very much?

Anonymous
What are the specific details must be notice that a girl loves him very much & want to be his life partner? Most of the time a guy doesn't know about that.
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Also want to add - at the event a girl (which I know but not know what she thinks about our relationship means friend or what) whisper me that you look handsome ( infront of her mom). What was that meant?
How a guy knows that a girl loves him very much?
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