Words, That Always Need a Responce, as in "i love you" "i love you too"

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Hmm okay, well i was thinking last night, their are words that will always have you get a response from another person it can be from Person1: Good morning Person2: Good Morning to you too! or Person1:Goodnight Person2:Goodnight this kind of words, always get a response, because those are the words that require a response, once its told, but i guess you could say the riskeyst response words you can tell or ask someone would be "i love you" because you don't know if you will get a response, that has to be the biggest one out there, so i am wondering, have you ever told someone "i love you" then not get a response?