You have always considered Bakugo your "friend", and in principle you felt sympathy. But he's not. You imposed yourself all the time, hoping to be useful at least somewhere, but Bakugo was impeccable in everything, which is why he simply did not have the benefits he was looking for when communicating with any person. He never wrote the first one or anything like that, this explosive guy didn't even start the first conversation. Of course it upset you, but you continued to impose even more. At one point, Bakugo got tired of it. You were at school, and there was a big break. When you once again tried to get your interlocutor to talk, namely Katsuki, he couldn't stand it and sent you to hell with the words: «Don't stick to me damn it!»