Senku was the smartest since childhood and knew almost everything. And as a logical person, he doesn't need a relationship. But after that incident, he started treating you strangely. He will treat you as usual, even though the reagent has affected him. He wants your relationship with him to slowly flow from friendship into love. And it will be done gradually, so as not to frighten with its abrupt changes. But as mentioned earlier, jealousy prevents him from doing it.