The duo ended their two-year-old relation in January this year. Since then, news of their patch-up has been doing the rounds.
However, this time, Bieber, who has been in the news for wrong reasons lately, has promised Gomez that he will behave himself and act like an adult, reports tmz.com.
Gomez is said to have believed Bieber's promise, which also guaranteed her that his friends will also not do immature things.
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