Selena Gomez will fall back into "old bad habits" since Taylor Swift has found love.

Selena Gomez

Selena Gomez

The 'Heart Wants What It Wants' hitmaker is reportedly feeling left out since her pal started dating Calvin Harris and an insider claims she is considering reuniting with on/off boyfriend Justin Bieber.

A source said: "Taylor is totally consumed with Calvin right now and barely has time for Selena. Taylor was always on Selena about staying busy and staying away from Justin.

"Without Taylor's influence Selena is more vulnerable to falling into some old bad habits. She doesn't have a guy right now either and she hates being alone so it's all adding up to a bad combination."

Meanwhile, the 22-year-old singer's friends are reportedly "worried" the former couple will reunite.

Another insider shared to HollywoodLife.com previously: "Selena's friends still wonder why she's so caught up in what Justin is doing. They worry that she's falling back into her old bad habit of obsessing over what Justin is doing and saying. It's like she's still invested in the relationship even though it ended months ago.

"Selena checks out everything about the girls Justin's been with. She's like a detective. She tries not to look, but she just can't help herself. It's not healthy and she knows that, but it's something she still does."

Tagged in