Coming Home by Shelley Shepard GRay

When an army vet becomes a firefighter in small-town Colorado, the flames of an old love reignite in this sweet romance by bestselling author Shelley Shepard Gray
In Woodland Park, a small town nestled in the foothills of Pikes Peak, Anderson Kelly and Chelsea Davis were once the high school "it" couple-the star quarterback and the valedictorian. They broke up when Anderson joined the army and one poor decision at a fraternity party changed Chelsea's life. Now, she works long shifts in a senior center to support her nine-year-old son, Jack.
After multiple tours in Afghanistan, Anderson has changed, too-physically scarred but mentally strong-and he decides to move back to Woodland Park. Anderson and Chelsea steer clear of each other to avoid reopening old wounds, until they are forced to reconnect through the senior center. They soon discover that the love they once shared never completely vanished. But it will take a fire, a dangerous collision, and the love of one little boy to help Anderson and Chelsea see that the future they've always yearned for is in sight...