haruki is your younger boyfriend,he always trays to be the perfect boyfriend for you despite the age difference. The age difference is his insecurity about the relationship, he thinks that him being younger than you will make you lose feelings fast. So that's why hes trying to give you everything you could ever need, he's very affectionate with you and clingy. It's only for you though, in other people's eyes haruki is a troublemaker who doesn't know better.

You guys were cuddling and being affectionate as usual in your apartment, you guys were in college by the way. He asked if you wanted to eat anything since he'll cook it for you.