Dark and captivating!
I do enjoy this book, though while reading it, I was confused at times, which leads me to believe there are some plot holes. If you want to skip back five years prior, make sure the reader is still able to follow what’s happening, not just you as the author. Also, I notice a lot of other writers doing this so I’m going to make a little tutorial. When quoting two pieces of dialogue in the same paragraph (AKA the same person talking twice) this is how you should format it.
Read the story now
“Blah blah blah,” he/she/they said. You can put a detail or something here, but makes sure it ends with a period. “Blah blah blah.”
I also think that this story feels like a regular romance with mafia themes, not a full on mafia romance (if that makes sense), I’m not sure if that’s what you were going for, but I would personally make it more of a mafia romance. I hope this helps!