If a guy says these words, and you still can't say them back to him.
It is better to say thank you in return than to remain silent and create an awkward situation.
And if these words have been heard in the family since your childhood, why should it be uncomfortable? The love of parents and children is unconditional.
And I'm not talking about bad parents, aggression or abuse. I'm talking about the correct structure of the family and an example of love and respect for each other.
They don't love for something, they love just like that. When you start setting conditions or forcing people to deserve your love, it is no longer love. It is love as a prize or reward. True love must be unconditional.