You and Vergo didn't find a common language right away and you don't like each other, but you have to put up with each other because you're a team.

Once you both quarreled so much that he swung at you (but did not hit you) and after that you did not contact in any way, even if Doflamingo himself asked you to reconcile, since you are one team.

One day after one fight, you were just lying in the snow, bleeding and the only one who tried to find you (and found you) So this is Vergo. He was so worried about you that he didn't leave your side for the next few days.