Selena Gomez

Selena Gomez

Selena Gomez gets very upset when Justin Bieber sends her text messages.

The 'Heart Wants What It Wants' hitmaker, who recently confirmed she had ended her on-again, off-again relationship with the Canadian star after almost five years together, is reportedly struggling to get over him because he still contacts her occasionally.

A source close to the 22-year-old beauty said: "[It's] up and down. [Selena's] trying to put him behind her. It's hard because they have just so much history. It is a process..."

The insider told E! News that even getting a text from the 20-year-old singer can put a damper on the 'Rudderless' actress' day.

But Selena is surrounding herself with positive influences, including best friend Taylor Swift, and has become "very active in her church" in a bid to keep her mind off Justin.

The 'Come & Get It' hitmaker recently admitted she will always support her ex-boyfriend.

She said: "I support him. I think I always will. I'm upset when he's upset, I'm happy when he's happy. I don't want anything to ever happen to him bad. It hurts me. That's all."

Selena is planning to celebrate Christmas with her family in her native Texas.