And apparently the Coldplay singer's two children with ex-wife Gwyneth Paltrow were also a factor in the break-up.
"Chris doesn't really want the relationship to end, but he needs to be flexible so he can see his family as much as possible," the magazine's source added. "He's crazy about Jen but wants to keep his own schedule and be able to do what he wants when he wants to do it."
But a friend of the Oscar winner claims JLaw has been very considerate of his parental obligations.
"Jennifer's been pretty good about sharing Chris with his family, in part because she has been too busy herself to have it become a real problem, but she still wants to see more of him," said the source.
This is the latest bump in the road for the elusive couple, who have rarely been photographed together since first hooking up last summer.