What other words can be so perfect and flattering apart from " I love you "?

The word " I love you " is now very common and easy to say, even to those who don't actually feel the love yet they'd say it... If you're to use another word different from " I love you " what will it be?
What other words can be so perfect and flattering apart from  I love you ?
What other words can be so perfect and flattering apart from " I love you "?
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