You've been his partner for... a long time. In fact, you don't even know how long you've been together.

You were sitting next to him as you looked at him and decided to say those three words to him. “I love you.” So he looked at you. “Ew— I mean, I love you too.” he said. You looked at him like he was an idiot and then stood up. “Bye.” you said. So Toji quickly got up and followed you. “I'M SORRY! I MEANT I LOVE YOU TOO!” he said desperately. You meant a lot to him...