A source recently told PEOPLE that Green has been "annoyed" that Fox "moved on so quickly" after their split.
"Brian is annoyed that she is so focused on her relationship with Machine Gun Kelly," the source said. "He doesn't understand the need to post social media pictures with silly captions to proclaim her love for him. They aren't even divorced yet."
"It definitely annoys Brian. And it stings a bit too that Megan moved on so quickly," the source continued. "Megan was always very private, so Brian just doesn't get what changed."
Source: Read Full Article