Taylor Swift is reportedly upset that Selena Gomez and Justin Bieber are back together. The "Slow Down" singer reportedly flew to Canada over the weekend to spend time with Bieber's family and Swift was not happy when she found out about it.

It was rumored that Swift and Gomez had ended their friendship before because of Gomez's romance with the "Boyfriend" singer. A source told Hollywood Life that Swift was shocked to find out that her best friend was giving Bieber another chance.

It's been said that the "Red" singer was trying to help Gomez move on by setting her up with Niall Horan from One Direction and Ed Sheeran.

"Taylor is completely baffled that Selena has yet again taken Justin back. She thinks that Selena is a lost soul and nothing will make her realize how bad Justin is until she no longer has a career," the source said. "Taylor is convinced that this relationship has and will ruin her health and life but she is finished with trying to help, she feels like she has tried enough and it hasn't worked."

So when did Bieber and Gomez reunite? According to Hollywood Life, Victoria Nosko, a friend of Bieber's family, let the cat out of the bag when she tweeted about how wonderful her birthday weekend was. Nosko, and Bieber's dad Jeremy, were both celebrating their birthdays over the weekend.

"Had a awesome b day weekend. thanks to @ErinWagner @JeremyBieber @justinbieber @selenagomez @CrazyKhalil had a blast!!"

She quickly deleted the tweet and posted, "Oops wrong name in my last tweet... what it meant to say... Had an amazing b day weekend thank you @ErinWagner @JeremyBieber @justinbieber @pattiemallette @CrazyKhalil had a blast!!"

A source told Hollywood Life that Gomez was in fact in Canada over the weekend and spent the entire weekend at a cabin with Bieber's family. Afterwards the two reportedly spent another five days together. Bieber posted a photo of the two on June 11 with the caption, "Our love is unconditional" but quickly deleted it.