What's the feud between Tevez and Sir Alex Ferguson? Why did Tevez betray Manchester United?

In 2007, Tevez joined Manchester United on loan and spent two fantastic seasons at Old Trafford, helping the team win the Premier League and the Champions League for two consecutive seasons. But in 2009, Tevez did not stay at Manchester United, but joined Manchester City, Manchester United's arch-enemy, which completely stimulated Manchester United fans and was branded as a traitor.

Sir Alex Ferguson, the former Manchester United manager at that time, said that Tevez demanded a high salary and left voluntarily, and that Tevez was selfish to play football in the 2009 Champions League final. Afterwards, Tevez clarified that Manchester United failed to keep its promise and bought out at the end of the season, which led Tevez to leave angrily.

I'm afraid the parties can't remember the right and wrong of that year either. They can only say that there is a reason to go and a reason to stay. In fact, after Tevez joined Manchester City, it completely changed the situation of Manchester Derby, and even Manchester City scored a score of 6: 1, humiliating Sir Alex Ferguson. Manchester City got Tevez, and later joined a powerful player, which completely changed Manchester United's dominance.

Of course, the release of Tevez this time, the release of Pique and Bogba by the coach in the last few years and the introduction of many parallel imports will not affect Sir Alex's great coaching experience. However, as an ordinary fan, it is not known whether Sir Alex Ferguson ever regretted letting Tevez go.