I think the reason why Bieber and Selena broke up is caused by many factors:
First of all, it is obvious that parents' refusal and disagreement are more direct. Selena's mother strongly disapproves of Bieber being with Selena. She thinks that when Selena and Bieber are together, Bieber will lead to bad Selena and label Bieber as a bad boy. The mother's disagreement and the family's disagreement caused Bieber and Selena to break up!
Secondly, Bieber's private life is still chaotic, and there are many scandals. According to media reports, Bieber often has an affair with models and actresses, which is the last straw to overwhelm them. How can you hold two tigers before, unless there is a male and a female!
Moreover, even if the work is very busy, it ignores the feelings of both sides. Isn't there an official announcement that many stars have broken up and divorced: gathering less and leaving more, their feelings have faded, and they can't take care of each other's feelings? This is also an aspect.
Besides, Bieber said that I really don't know what happened, and then I was immersed in my own beliefs.
As Bieber said: I broke her heart and she broke mine. ? No one can understand the relationship between Bieber and Selena. Maybe, even they don't know.
Finally, at that time, Selena and Bieber were young, immature, in the embryonic stage of adolescence and impulsive. Their relationship is not very mature, just like a beautiful glass bottle, fragile! Now, Bieber has his own family, and Haley is the best medicine to cure Bieber. Selena is also more and more chic. For both of them, this is the best ending.