Where would you draw the line between appreciation, affection and love?

Appreciation as : a feeling or expression of admiration for someone.

Affection as : a feeling of liking someone and truly caring for him or her.

Love as : strong physical attraction and emotional attachment.

Please feel free to change these definitions into something more suitable.

And when would one of these feelings be right or wrong in any given situation? I'm thinking about friends, family members and partners.

Where would you draw the line between appreciation, affection and love?
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