Love Again [Taekook story top!tae]

"If you walk out that door, I won't be here when you get back"

Jungkook stared at Taehyung who just gave him an ultimatum, "We both know you won't do that. Now calm down and when I'm back let's talk solve this argument like we always do"
On the contrary to his belief, when Jungkook came back the apartment was empty.
He lost Taehyung.
Taehyung and Jungkook broke up. What would happen when they meet again for a wedding?