Pete Wentz 'couldn't trust' Ashlee Simpson

Pete Wentz reportedly found it difficult to trust Ashlee Simpson just before their split.

The couple announced their divorce earlier this month, but the Fall Out Boy frontman was frustrated by Simpson's late night partying, according to Us Weekly.

A source told the publication: "Ashlee has been out late partying for the past few months. She would lose track of time.

"[Pete] would constantly check in on Ashlee, and he'd have his friends call the house and her cell to make sure she said she was where she said she was going to be.

"He felt like he couldn't trust her."