Brian Austin Green is not being shy with how he feels about ex Megan Fox’s new relationship with Machine Gun Kelly. 

As we previously reported, Brian posted an Instagram slideshow of his sons with the same caption Megan used for a photo with her new man that read: “My heart is yours.” 

According to People magazine,  Brian used the moment to express his growing resentment about the whole thing. 

“Brian is annoyed that she is so focused on her relationship with Machine Gun Kelly,” a source told the outlet. “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 added. “Megan was always very private, so Brian just doesn’t get what changed.”

The couple share sons Noah Shannon, 7, Bodhi Ransom, 6, and Journey River, 3. Brian has been caring for them as Megan wraps up filming her latest movie with Machine Gun Kelly. 

We’re so sad they’re going through this. For the children, we hope they are able to work it out.