'They've had a really complicated relationship': Selena Gomez and her mother Mandy 'have had a strained bond for three years due to managing issues'... as it's claimed they fell out over Justin Bieber reunion.<br /><br />It was recently reported that her mother was upset after she rekindled her romance with pop sensation Justin Bieber.<br />But Selena Gomez and her momager Mandy Teefey have allegedly had a 'strained' relationship for over three years after they parted ways as manager and client.<br />As the 25-year-old singer bounced back with a new executive team in 2014, the breakdown of the pair's professional relationship 'caused a major rift' between the mother and daughter, an insider told E! News.<br />
