Up in Flames by Jamie Garrett

One moment from the past haunts Matt Rivers. With every fire he works, he tries to forget his own secrets by saving others. But in the quiet of the night, he’s haunted by dreams and guilt from a decision he made over ten years ago—one that kept him safe but left his father dead.
Everything changes when he rescues Lauren Mancini from a hotel fire. The last time he saw her, he was barely eighteen years old, and running for his life. He has no right falling in love with Lauren all over again, especially when she now has a son, but when he’s with them, he feels at peace for the first time in years.
Matt needs to protect the family he wants from the one that refuses to let any of them go. But Lauren has secrets of her own, ones that have the potential to shatter Matt’s entire world.