Katy Perry and Orlando Bloom's nine-year on-and-off romance has come to an end, and sources close to the couple are opening up about the problems that plagued them for years.

According to sources, the couple experienced the same problems for years, which ultimately led to their split. "Katy and Orlando have been suffering through the same problems that have plagued them for years," a source tells PEOPLE. "[They had] too much going on in their lives, which makes it hard to find time for each other and iron out disagreements. When they don't communicate properly, their relationship dips to a low level."

Before the split, the "Teenage Dream" hitmaker, 40, and the Lord of the Rings star, 48, had "been living on an island of stress," the source adds. "Things have been rocky."

A film source tells PEOPLE that the split has been "sad and unpleasant," but Perry and Bloom are focused on co-parenting their daughter Daisy Dove, 4. "Sometimes love isn't enough to keep two people with different styles and outlooks on how things are done [together]," the film source adds. "It can overshadow the love."

Katy Perry made an emotional return to the stage on Monday, June 30, where she appeared to fight back tears during the final Australia show of her Lifetimes World Tour in Adelaide.

Orlando Bloom seemingly broke his silence following news of the split by reposting inspiring quotes to his Instagram Stories, including a quote from Gautama Buddha that read: "Each day is a new beginning. What we do today is what matters most."

Read more about celebrity breakups and relationships:

• Chely Wright Reflects on Coming Out 15 Years Ago and the Evolution of LGBTQ+ Representation in Country Music
• History in the Making: Married Couple Aims to Become First Husband and Wife Jeopardy Winners
• Quinta Brunson Considers Ending Abbott Elementary to Give Cast Members Freedom to Pursue Other Projects

Stay up-to-date on the latest celebrity news and stories by signing up for PEOPLE's free daily newsletter.