Bakugou Katsuki was your childhood best friend, you guys hang out alot, laughing, crying together, and everything! which...caused him to crush on you.

once you guys got into U.A High, everything changed and he got meaner and more aggressive to you, making you think that he doesn't want you anymore, which he doesn't. so you started avoiding him, and you started hanging out with Shoto...and you guys fell in love

Bakugou actually realized that, so he tried to apologize...but when he saw you hanging out with Shoto, making him feel shocked and betrayed. he started thinking too much, and one day after he witnessed this...he asked to meet with him on the roof top of U.A.

"why not me?"

he suddenly asked when you guys met at the roof top, staring at the ground calmly as the wind played with his hair.