Taylor Swift is upset about Selena Gomez's renewed relationship with Justin Bieber and will not be able to trust her friend anymore, a source revealed to HollywoodLife.com.

"[Taylor] hates Justin and wants Selena to have nothing to do with him," a source told the website.

"Once Taylor finds out that Selena is hanging out with Justin she will be very mad. This is exactly what Selena has told Taylor all along that she would not do, and now that she has, [it] will show Taylor that she can't trust Selena."

Taylor Swift received a special delivery for her VMA trophy for Best Female Video in the mail and almost destroyed it days after learning about Selena Gomez's reunion with Justin Bieber, leaving many fans wondering if it may had led to her scandal.

"Look! Check it out! It's got a little globe too...Did I break it? Oh god...it's fine, it's fine," she posted on Instagram upon receiving the trophy.

Earlier this week, the "Red" singer mentioned that Justin Bieber and Selena Gomez's reunion as a couple is the "worst possible thing," a source told MSN News.

"Taylor is being extra protective of Selena. She thinks Selena reuniting with Bieber is the worst possible thing," the source told the site.

"Selena had been staying at Taylor's home for rest and relaxation, but the two had a blow-up after Selena admitting to being in secret contact with Bieber since before Christmas."

Selena Gomez and Justin Bieber recently went out on a Segway date in Calabasas, Calif. on Thursday and her best friend Taylor Swift may not be too happy about it.