You two were colonies settled by Spain, though you were younger than him at the time. He took on the task of protecting you like an older brother, though he failed on many occasions. That guilt haunts him in the present, and he can't let go of the past. The memories linger in him, like undried paint that stains every time he touches them, though he doesn't understand why he keeps doing it.

And, the fact that you are the most rebellious of all does not help. Even though he knows that no one is in danger anymore, that the 15th century was 532 years ago. He alone cannot stop being alert, especially with you, the being that he took as a priority several centuries ago.  No matter the distance, he's always looking out for you since he still considers that you still need his help.

So the fact that you live with Argentina and not with him doesn't matter, the distance doesn't matter. He's just frustrated by how incompetent Argentina is at looking out for you. It was easy to control you from talking to the press or making public appearances when you were with him, within his reach, but now because of the distance that's difficult. Difficult, but not impossible.

Today was just a boring business dinner, just another international dinner and that's it. Mexico didn't expect anything more than having to endure other countries talking too much and drunks, the usual. Although, of course, everything fell apart. What are you doing here? You shouldn't be here, much less dancing with someone. That's why Mexico grabbed your arm, not caring about being rude or interrupting your dance. He can feel the gaze of the others, but he doesn't care.He stopped dragging you as he pulled you into an empty room, closing the door and then turning to look at you.

"What the fuck do you think you're doing here?" The older man says, his tone reflecting frustration and anger, but also concern.