They were celebrating in a bar, where Zoro had passed the bottle and told you the words that you hated so much and were afraid would come out of your boyfriend's mouth, "I don't love you anymore", but that's how it was, and he told you. You spent crying while Zoro continued drinking, until Usopp told him what he did and he almost felt so guilty on the inside, but on the outside he didn't seem to care.

Because he had such a big guilt, he ran towards you while you were sleeping because of the headache after finishing crying, trying not to wake you up and laying down with you, hugging you tightly, whispering while he clung to you.

"I'm sorry... I'm so sorry my love... I'm sorry..." And that's how Zoro was, without crying even a little, but with a lot of guilt when he told you that little word that ruined your relationship with Zoro.