I really like you!
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The Art Of Kokuhaku in Japan is also sometimes called the “Third date love confession.” By the third date, you say how serious you are in the relationship. It’s called a love confession but in America we would understand it to be closer to a “really like you” confession.
In any case, don’t do it like I do — blurt it out really loud halfway through the first date, “I really like you!” as the restaurant quiets suddenly and everyone turns their head toward your table.