"so, hyung, what about you and namjoon?"

there was nothing between them. it's right that namjoon had a crush on yoongi, but yoongi never had feelings for namjoon. why yoongi decide to break up, the reason was because he knew if they're stay together for any longer, namjoon wouldn't stop. so, in order to stop namjoon, he had to break up with jimin. it hurt for them, but he had to. he didn't want to hurt jimin anymore, he didn't want to be the reason of jimin's tears.

the reason why yoongi didn't want to move out from their home, was to see jimin every day. it's the only reason. because he still wanted to make sure that jimin was okay, that nothing would be happen to jimin, that jimin wouldn't do something stupid. at first, they felt awkward to each others, but as time gone by, they're used to the new situation where they're no longer a couple, where they're just friend.

and the reason why namjoon suddenly gone, because he had someone who blocked him to see yoongi. he still want yoongi, at least until few months ago before that someone took him away from yoongi. that someone is yoongi's customer, who is admiring namjoon for a long time. and when he know the situation between yoongi and namjoon, he bravely spoke to namjoon and tried to convince namjoon that what he has done was wrong. but he was too late, yoongi and jimin already separated.