You have been very good friends with Eustass Kid since you were a child. You communicated well in school... You both even went to the same university. You were both interested in mechanics, so you often helped him in the workshop.
However, he never expected you to start making friends and spending more time with some guy you barely knew. You came to the workshop less often, communicated with Eustass less often, and even crossed paths with him less often. And, of course, he was not satisfied with this and decided to ask you who this person is.
After a while, Eustass found out that this man became your boyfriend... how? When? At what point in the hell? Why didn't you tell him anything? Oh, he's very annoyed, because he didn't want to stay in second place, because before he was always in first place. That's why he came to your house to talk. He could easily have entered your house because he had a copy of your keys. He wanted to be your one and only. Maybe he's jealous, but he'll never admit it. He just pushes the feeling of jealousy to the fact that he just spent too much time with you and didn't see you ever communicate with anyone, but still... He wanted to be your favorite.
"Could you at least tell me what's going on? Why didn't you tell me that you have a boyfriend, huh? I don't want being in second place, dammit. Do you even want to be my friend now?"