Sunian should've just talked it out with Shao Xue. But knowing his character, he'd sometimes choose irrationality which is more close to a real life scenario.
Growing up in a community where everyone knows each other, I can really relate to this. It's funny because of how I can recall some similar instances in my life. There's this one line that really struck me " I want us to always be happy, but I hope nothing changes in the future". I mean, our definition of Happiness changes as time passes by and unfortunately, that includes the people around us. The people whom we shared our happiness with in the past may not be the same people that we're sharing our happiness with today.