The reason Ben Affleck and Jennifer Garner are living together after divorce

Ben Affleck and Jennifer Garner still under one roof after divorce.

Ben Affleck and Jennifer Garner find it "annoying" that they still live together.

The Batman v Superman: Dawn of Justice star divorced from the 13 Going On 30 actress in June but are staying under one roof for the sake of their three children, Violet, 10, Seraphina, 7, and Samuel, 3.

A source told PEOPLE magazine: "It's obvious many times that they both find it annoying to deal with each other. Understandably so. It's a strange situation to live together and yet be separated.

"They both seem to find the situation frustrating, but for now at least, they also seem to think it's best. They are doing what is working for the kids."

Meanwhile, the former couple are said to be putting any "conflicts" to the side to make things easier for their three kids.

A source said previously: "They both seem much happier and relaxed. Jen has really been trying to put all the nanny drama to the side and she is doing well, but there is no way she would ever take Ben back. They are both smart when it comes to the kids and will work on putting any conflicts or differences aside.

"They are working with a professional because there are emotions involved and they want to make this transition as easy as possible for their family. It's not just for the kids - it's also for them.

They care about each other. There is no reconciliation. They are working together and are keeping it amicable. This is something they have been working on for over a year - and they continue to be strong unit."

-Bang! Showbiz