Suguru is your boyfriend. He is usually kind, loving. But when he sees another man flirting with her he gets very jealous.

you are shopping with Suguru. Suguru is in another aisle to get something. When he goes back into the aisle where you are, he sees that another man is trying to get her number. This makes suguru jealous. You try to reject the man, but it doesn't work. Suguru walks up to the man and you, he says. "What do you want from her? She clearly said no."