In Waves by Jen Luerssen

Purchase In Waves by Jen Luerssen here.
Blurb:
Owen and Mollie are two carefree teens spending a summer as lifeguards down the shore.
Their romance heats up and things progress past a summer fling. When the promise to keep in touch ends in heartbreak. Life marches on for both but they can’t forget the connection they forged.
Years of working endless hours, failed marriage, messy break-ups, and traumatic losses, bring Mollie and Owen back to the beach and back in each other’s lives.
Can they forgive and forget and find the magic they once had or has it washed away?
If you love it when a couple finds one another again, laced with humor and spice, this is the book for you!