Justin Bieber and Selena Gomez are back together for a "trial period."

The on/off couple have recently rekindled their romance but Selena, 20, has insisted it is not a permanent arrangement as she is worried about getting hurt again.

"Justin and Selena are dating but they are taking things slow. Coming back together now, the couple has years of experience and they're treating the relationship more maturely this time around. They now know what the stakes are. Selena is keeping her heart from being broken, so she is definitely looking at this as a trial period in their relationship. She's definitely taking [baby] steps back. When they first started to date, it was amazing but they were too young and it was too much. They didn't even know what love was and she got all mixed up," a source said.

Selena recently revealed she loves spending time with her friend Taylor Swift - who has dated stars including Harry Styles, Jake Gyllenhaal and John Mayer - because she gives great relationship advice. "I love Taylor, she's the best. I just love her because she's so cool, she just normal down to earth, awesome defiantly the girl you want to call if you're going through heart ache," she said.