Justin Bieber & Selena Gomez 'Cheating' Scandal, 'Flirts' With Chantel Jeffries, Kayla Phillips, Catherine Johnston-Paiz: Girlfriend 'Hysterical,' Crazy Fight Ensues [PHOTOS]

Rumors initially suggested that Justin Bieber and Selena Gomez were "officially" back together. But is the Biebs enjoying the "single life" too much to be tied-down in such a serious relationship?

According to HollywoodLife.com, the 20-year-old "Believe" crooner was spotted at Chris Brown's first-ever Annual Skate Jam Party on Sunday (June 29) - NOT with Gomez. Instead, Bieber was snuggling up to a chick named Kayla Phillips. The two were very flirty - Bieber kept touching Phillips and whispering in her ear:

(Instagram) 

After chilling with Phillips, Bieber spent some "quality time" in the studio snuggling up with two other beauties -  Chantel Jeffries and Catherine Johnston-Paiz! 

He even posted this viral snapshot on Shots:

As several Mstars fans probably remember, the Biebs used to "hook-up" with Jeffries (an aspiring model) before allegedly getting back together with the "Come & Get It" songstress...

Interestingly enough, Jeffries and Johnston-Paiz didn't just hang with Bieber at the studio - they were spotted leaving his private home on June 26. Hmm, threesome?

Now, Gomez's heart is apparently "broken" - again. Jelena got into a huge fight over the weekend due to Bieber's actions:

"It was over other girls, she found out Justin is still talking to a lot of other girls when he promised to stop," a HollywoodLife insider reveals. "Chantal Jeffries was one of them and Miley Cyrus. Selena totally believed Justin, so when she found out he wasn't being totally honest she freaked out on him."

The source continued, "He did what he always does and got super defensive - and now they're not talking and Selena is hysterical. Seeing Justin with other girls is horrible for her, it's driving her crazy... She doesn't understand why he does this to her, and she doesn't know what to do. He's got her questioning everything." 

At this point, the 21-year-old starlet is torn over what she should do:

"She doesn't trust him, but she can't give up on him because she feels like she can't live without him. It's so much drama and it's not good for her, she's miserable but she doesn't want anyone to know how upset she is, especially Justin," the snitch explains. "She's trying to act like she doesn't care and is totally happy but the truth is she's been spending half her time crying. She feels so humiliated and rejected, the games he plays with her head really mess up her self-esteem."

Oh, no... what does the future hold for Jelena?