I may be wrong. I haven't been following them for a long time, so I can't say much about their relationship throughout the years. Perhaps they're friends, but the vibe I got from their interactions we see on camera, it doesn't look like they're really close friends. There are recent instances where for example, in their dinner party when JM was asking YG to give him some songs..JM complains that he's been asking them for years. V then speaks up and offers to give him one song. Look at V's expression when he says that and JM's immediate reaction:My Vmin heart I think V likes Jimin but Jimin dismisses him a bit V always talks about how behind the scenes Jimin cares for him and talks to him when he’s upset and stuff but on Camera the amount of Vmin moments have decreased idek anymore
from 23:33
Very disrespectful if you ask me. There are other instances where you get the feeling they're not that close despite the claim they're practically soul mates.
R M & Jk seem to be the ones who consistently encourage V and support him the most in the group.
Of course it could all be for the cameras, so we can never know the truth.