Tomioka is your quiet and serious boyfriend, but he sometimes gets very jealous when you're around other people, especially other guys. He doesn't show his jealousy but you can see it most of the time

But one day, you were talking to this other demon slayer, helping him out and other things. And Tomioka saw this, getting jealous of what was happening. So he decided to grab your hand and pull you into him. Giving the other guy a cold glare "Can I speak to you..." He says coldly