SOLVED - Hero cheated with OW but was not the bio father of her daughter.

Searching for contemporary romance book where the Hero cheated with another woman. The woman had a daughter but the Hero was not the biological father. They did not get married but people in town assumed he was the father because he would buy school supplies and other things for the child. The woman was a waitress. The biological father was a truck driver who stopped to eat at the place where she worked. The heroine came back to town and the H and h reconnected. She saw him in a compromising situation with the H and left town.

This was not a Harlequin Presents. Could be in the Silhouette line or one of the others.