Something must be done

Okay, so we are at the stage in my fanning of Guardian where I need to put in some serious worldbuilding thought. Because the world /as given/ in TV canon makes zero sense of the way Shen Wei responds to Zhao Yunlan. Zero. If I take TV canon at face value, Shen Wei is at psychotic-stalker-levels of emotional and relationship development, and the way he acts the rest of the time contradicts that. (...usually)

So. We need some plausible rationale in here.

( Possibilities )