Haha that's the debate I hesitate to enter. Basically poor ZWJ is the victim of the hate debate now. Each one has his own interpretation of whether ZWJ is always clear in his relationship w ZM.
But anw, from my POV, I can see hints of him being frustrated with having to please ZZR when she is jealous/angry. Their relationship is kinda respectful, but distant. Perhaps Joseph is not so good at playing the emotions with more nuances.
The part at WD is more of happiness when reuniting w his family. We all know WD has a special place in his heart. So its more like he is happy to show his Tai shifu that he is gonna get married, that he has grown up, to make his Tai shifu happy after what has happened to SQS.
Dont forget he skipped the holding hands part and went straight to carrying ZM, not just once, but 3 times! The last one (after Gai Bang) was not necessary, but he did it anyway. So with ZZR it's kinda like he consciously do it to appease her. For ZM it'a pretty instinctive