Selena Gomez and her on-again, off-again boyfriend Justin Bieber are reportedly off... again. Reportedly Gomez thinks something went down between Bieber and her (former) friend Kylie Jenner.

According to The Sun (via Hollywood Life), at first everything was fine between Gomez and Kendall and Kylie Jenner. The trio was reportedly sharing clothes at Coachella and posted several Instagram pictures of them together.

However, after the music festival ended Gomez unfollowed the Jenner girls on the photo sharing site. The next day she also unfollowed everyone which included Bieber and Taylor Swift.

"Selena is convinced something has gone on between Justin and Kylie," a source told The Sun. "At Coachella [Justin and Selena] looked to be back on track. Selena was hanging out with Kylie too and they were behaving like best friends."

"Then [Selena] heard stuff about Justin and Kylie and felt totally betrayed," the source continued. "She went beserk and called it off again. Selena is in a really bad place at the moment - she's on the edge and now overcome with jealousy. She really needs to wash her hands of Justin for good."

The "Come & Get It" singer has been posting somber photos and song lyrics on Instagram recently possibly hinting that something is amiss. In one picture, Gomez shared a review of Mary J. Blige's 2007 album "Growing Pains" with the lyrics to the song "Work in Progress."

As we previously stated, the "Come & Get It" singer then unfollowed everyone on her account.

Earlier in the year Gomez did a secret stint in rehab. A source told E! News that she checked in right after a picture surfaced of her and Bieber riding Segways in his Calabasas neighborhood.

"The last straw was seeing them on the Segways," the source said. "She needed to work on her emotional life. She needed to learn tools on how to deal with Justin and letting go of that relationship."