And another source revealed there is "still a lot of love" between the pair.
They told the New York Post's Page Six column: "There is a lot of love still between the two of them. The split is as amicable as can be. Ana is great, but I also think there's something to be said for the fact that Ben has a family and he really wants to be there for his kids and Ana is in a different place in her life ... It's sad, but for Ben, his children come above everything."
The couple were first romantically linked in March last year, when they were spotted enjoying a romantic getaway to Havana, Cuba, after meeting on the set of Deep Water.
Affleck has three children - Violet, 14, Seraphina, 11, and Samuel, 8 - with his ex-wife Garner.