Buggy and Shanks were in Roger's crew from childhood until you came, Buggy only competed and fought with Shanks, even though they were friends. But after you came.

You and Buggy were as enemies together and unfortunately roommates. And you used to compete and fight with each other.

Just like tonight when you two had a competition to see who drinks more. and you lost but both of you were completely drunk and you went to your room drunk and you fell into each other's arms