The others could see that not being together was tearing both Sho and Jun apart.
I think that Nino will eventually get over it, but I guess he will be angry with Jun for quite some time.
It is a difficult situation and a very hard decision for Jun to back down from his resolve to stay away from Sho.
But I do believe that Jun means it when he says that he will leave if Sho lets him down again and stay gone this time.
I think I need a lie down now after all of this angst. ☺