When he was a child, after snapping out of his childish stupor and seeing the true colors of life; rage and hatred was all Dabi knew.
It clung to him, like a second skin, patched and held by straps to his scarred skin, again and again as the feeling sank its claws on him time after time. With each day that passed, his hatred for heroes and society kept on growing, a bottomless pit that would never be filled regardless of how much it was fed. It couldn't be cured, and sticking a bandaid over it wouldn't do any good for a wound that was still open and bleeding on the path he walked, the people he knew all stained by the blood dripping from his emotional baggage.
And then there was you; pretty you who he met after joining the League.
You were slowly but surely gaining ground on him. You were ruining everything for him, his plans, his ideals; there wasn't a single thing in him that had bee left untouched after meeting you. How was he supposed to fulfill his plan against society if he had you weighing on his mind?
He wanted to hate you, he really did, or at least forget you and permanently ignore your existence. But doing so was far more difficult than loving you, because he couldn't find reasons to hate you, but he already had plenty of reasons to love you. It was surprising, in his opinion, how easy it was loving you, how easy it was for him to do so as if it came naturally to him; loving you was like breathing. So natural and calming yet so logical, he breathed to live, and he loved you to keep going, wasn't that similar?
Regardless, he couldn't find it him to have a single bone against you. Damm you for doing this to him, even if he wasn't sure if it was a blessing or a curse.