He is an asshole, and a liar. get ready for this you may be overwhelmed:
Perrie edwards had a lot to do with him leaving. for example take what louis walsh said who is an x-factor judge.
“What I found in the past is as things get on, and as they get girlfriends, the girlfriends are whispering things in their ears and saying like, ‘You should be a solo star,’ ‘You should be the lead singer.’ That’s usually the problem,” Louis told Ireland’s RTE Radio One
also, i believe that naughty boy influence zayn like perrie could have. Saying things to him like: you should become a solo artist. because notice that zayn was seen going to a studio, naughty boys studio. they have been working on something for a while we all know. but didnt zayn say he wanted to be a NORMAL 22 year old, last time i checked recording songs as a solo artist wasnt being a normal 22 yr old.
and perrie was seen SMILING the day after zayn left! hmm? this is more proof to the theory that she influenced him to leave, to be a solo singer. because when you convince someone into doing something you are usually pretty happy.
i will it to you to believe my theory if you want.