It isn't really hard to see what has happened.
He has had a strop in diary room, asked to leave, insisted on leaving and the normal placating voice of BB was clearly not enough.
Perez said "he came up and spoke to me" .... i.e. - a face to face encounter with a producer who has basically took him aside and said "look, you can leave if you want but this is the best series of BB in year, massive viewing figures and everyone is talking about YOU. It IS The Perez Show, you would be crazy to walk away".
So he stayed. Yes they didn't FORCE him to stay, but they made it seem to him that he would be blowing something big if he left. They did it for their ratings. They alluded to his popularity to keep him in, and it is very wrong.
That is a step beyond the usual convo's in the diary room where they try to say "don't you think you will regret leaving if you go?".
Not to mention the fact Cami-li apparently got a warning for threatening to slit Perez's throat! We weren't shown any of that were we?
IMO Channel 5 created a monster this year. They threw in known assh***s in order to make a huge assh**e stew! One gets booted for groping, another for being a racist sexist pig, the paper's were slagging them off so when Alex basically was going off on one in a very homophobic direction, rather than face more outrage in the press, they offered him a way out. I still refuse to believe there is any legitimate reason for Alex walking upstairs and none of his conversation being played to the public. Very dodgy indeed. Clearly the Cami warning was in the same face-saving vein.
No longer are we getting a true representation of the BB "experiment". It has become a victim of its own success, and is a farce.