Megan Fox’s romance with fiancé Machine Gun Kelly has fans swooning, but the actor’s friends are concerned that the couple’s relationship is ‘toxic.’

An insider told OK! Magazine that the 35-year-old actor is “totally obsessed” with the rapper, real name Colson Baker, and that “nothing else matters to her.”

The 32-year-old musician recently told Howard Stern that if the couple ever divorces, they should “go out on a murder/suicide.”

Baker’s comments “really set off alarm bells among her friends and family, and for her to even joke about that sort of thing is just beyond twisted,” according to the insider.

“Even if Meghan and MGK stay together,” the source continued, “people are concerned that the relationship is toxic.”

“Their intense emotions can be very toxic,” the source explained, “but they both seem to like communicating in a semi-aggressive way to each other.”

According to the source, the couple “has intense short spats.”

“Megan appears bothered,” one insider said, while another added, “Honeymoon period is over, reality sets in.”