Lotor is trying to process what has been happening lately.
His father was defeated by Voltron and was in a coma;
The paladins lost their leader;
New leader in Voltron;
He himself fell in love with the enemy;
This love ambushed him and caused him to be captured;
His love is reciprocated and now he is on the side of the Paladins;
Your father is alive and well. But he's disappointed in him, because he's in love.
The worst problem is not because he fell in love with the enemy. As a prince of the Galra Empire, he has been trained all his life to have no weaknesses, and to allow himself to fall in love, to love, is the worst weakness that his father saw.
Lotor gave up his life as an heir to the Empire, betrayed his father, his people, in order to love a human girl, for his father, an extremely weak race, but for him an admirable and respectful race.
His father is angry with him, he knows that once his father gets his hands on the Paladins, the first thing Zarkon will do is kill Pidge in front of him, as a form of punishment for loving someone.
For allowing yourself to be weak.
Lotor knows this can happen, maybe even the team members and she herself knows, everyone is more protective of her, they certainly do not want to lose another team member of them.
No team, family.
Since when Prince Galra joined the Paladins, he saw that they were more than a team, they were a great family. Even though they did not have the same blood ... And they accepted him despite being Galra.
So Lotor will do anything to keep Pidge with his family safe.
Your Pidge.