According to TMZ, the former couple has spent the last three months separated as he was in Europe filming on a movie and she was working on her TV show in L.A.
However, the actor’s schedule requires him to stay in Berlin until December and Keibler is said to have found it hard to deal with the long distance.
“Both sides realized there is no way to have a relationship when you don’t see each other,” a source told the gossip site.
The two reportedly both agreed that it was best for them to end the relationship.
“He was very respectful, adult about the situation … he reminded Stacy that they were friends before they dated and wants to be friends after,” the source added.