Winston stood up for her, to the point he was willing to abandon an entire Tiger village (his people) to give her his personal protection. man if she doesnt take him then she isnât worthhis efforts.
Bai gave him the courage to be the Tiger King as I recall he even said he couldn't and she said if you don't try you won't ever know or whatever she said. He out shined and yes he did it for her, so I am not surprised by his loyalty.