Recalling the way they used to be together, he often had a childish side, like a child who never grows up. Beneath the adult exterior, there was a mischievous heart.
He liked to be sharp-tongued with her, often making her both annoyed and angry. But she remembered that when she was upset, he never bothered her; instead, he stayed by her side, considerate and gentle.
In matters of love, he was probably a very cautious and careful person, and his "kindness" to her might be a bit strange. It was because he regarded her as his own, so he teased her, he bullied her. But if it were someone else, even if it was his own brother bullying her, he wouldn't allow it.
Take the incident with Zhi Chen, for example. He was angry about it. Even though he used little schemes, like pranks, he still needed to vent his anger and punished Zhi Chen for her.
He was the kind of person who fiercely protected those close to him.