I think he was because of the way he disclosed that they were dating without asking both of them. Pran implicitly…
OK cool that's what I was thinking just because Wai is Pran's best friend doesn't mean he has to know every SINGLE thing about Pran. Pran also can share however much information he's willing to offer. That was not cool how Wai just open the curtain and let everyone hear and see Pran and Pat when they weren't ready. Honestly does Pran know that Wai was the one that opened the curtain and let everyone hear them? Sure Wai was taken by surprise about Pran and Pat's relationship and I understand that he's hurt that he didn't know because him and Pran are super close but he still should've communicated his thoughts to Pran before getting mad.