"There's no huge reason except their distance apart," a source close to the couple tells PEOPLE, explaining that the decision was mutual. "With his season and Kim's filming [Keeping Up with the Kardashians] it just slowly split them apart."
The source adds: "They tried to keep it as low profile as possible when they were together. They were acting as if they were single or just having fun, but they never were – it was the real deal. They were always strong, but before Kim left for Europe they decided it's not fair that they don't get to spend more time together and ended it."
– Jennifer Garcia