To those complaining, this is a gag manga. Its not supposed to make huge statements on how to properly treat your girlfriend or potential girlfriend, just to make fun of the whole romantic rival trope from the typical otome stories. I get it if that wasnt the case, but it is and we shouldnt look too much into.
Both main characters are into each other. It was obvious on the other version and now that is properly serialized, it will be again.