Machine Gun Kelly and Megan Fox.Photo:Matt Winkelmeyer/Getty

Matt Winkelmeyer/Getty
Machine Gun Kellyis opening up about a difficult experience alongside fiancéMegan Fox.
On Wednesday, the musician, 33, released the song"dont let me go,“which includes lyrics that allude to Fox’s miscarriage, which the actress revealed last year in her book of poetry,Pretty Boys Are Poisonous.
Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
Machine Gun Kelly and Megan Fox.Phillip Faraone/Getty

Phillip Faraone/Getty
While speaking withWWDabout her book of poetry in November, Fox, 37, opened up about themiscarriageshe experienced alongsideKelly.
Talking about the pregnancy loss, Fox said that she also had “other things” happen to her that she hadn’t yet spoken about publicly.
“That experience was so much harder than I would’ve anticipated it being, and I’ve really analyzed, ‘Why was that? What was that so difficult for me?’ Because when I was younger, I had an ectopic pregnancy, I’ve had other things that I’m not going to say because God forbid the world will be in an uproar.”
Megan Fox and Machine Gun Kelly.Lester Cohen/Getty

Lester Cohen/Getty
“But I’ve been through other similar issues, but not with someone who I was so in love with,” Fox shared.
Earlier that month, the actressshared additional details about her miscarriage, which she wrote about in two poems in her book.
“I’ve never been through anything like that in my life. I have three kids, so it was very difficult for both of us and it sent us on a very wild journey together and separately…trying to navigate, ‘What does this mean?’ and ‘Why did this happen?’” she said during a sit-down onGood Morning America.
“I will pay any price,” wrote Fox. “Tell me please / what is the ransom / for her soul?”
source: people.com