Reason For Split? Jen Slammed Ben's Romantic Getaway With Ex Shauna

Ben Affleck and his much younger Playboy model girlfriend Shauna Sexton are over — and RadarOnline.com has exclusively learned that his ex-wife Jennifer Garner could have been the reason behind the sudden split.

A source told RadarOnline.com that Garner, 46, was furious when Affleck, 46, jetted off on a romantic getaway with Sexton, 22, just hours after the coparents of three finalized their years-long divorce on Friday, October 5.

“Literally right after the meeting for the finalization of the divorce, Ben took off to Montana with Shauna. And Jen was really annoyed and upset,” a source explained.

“She thought it was so disrespectful and tacky that he would do that right after a meeting finalizing their union in which they have kids and had a significant life together,” continued the source. "And she told him how she felt.”

As RadarOnline.com reported, Affleck, who completed his latest stint in rehab last week, and Sexton enjoyed a steamy trip to the country property he once shared with Garner over the weekend. The model shared photos and videos of the then couple's rendezvous on social media.