why did the band chẻ, phân chia, split apart

They're not splitting.They're just taking a break.
And the reason why they're taking a break is because they've done alot of things like do âm nhạc videos,do tours around the world,get interviewed,make new albums and coming up with new songs.They're really tired and they need a break.I mean think about all the things they did for the past 6 years.The guys did everything they could to make us Directioners happy.

I Think Zayn Wanted To Shine On His Own, And His Doing Great So Far# So Far So Great!!!!!!!!!!!!!!!!