What does it mean if a girl says ~ that's very kind of you ~?

If a girl says to you, that's very kind of you,

It can be seen from this sentence that this girl is extremely appreciative of your behavior language and practice.

He means

Thank you very much for your existence.

Generally speaking, if a girl can say this to you, she not only has admiring eyes, but also especially wants to have your company, so this girl is expressing her willingness to communicate and get close to you.

In other words, as long as you think this girl is nice and you want to be with her, then as long as you respond to his statement, it is very likely that you will enter the stage of love.

In this respect, because you appreciate and like each other, you may be very happy together and have a happy ending.