This Year's Love (Ward Sisters Series, #4)
Lucy Gage

Oncology nurse Annie Ward has spent her whole life competing with her older sister, Emily, in every single thing, especially when it came to their parents' affection. The ultimate insult came when her mother overlooked the fact that Annie was instantly attracted to handsome, beefy Josh Ricker from the moment she met him, and instead, pushed the man toward an uninterested Emily.
For over five years, Annie sat and watched her sister barely appreciate Josh while she listened to Emily's complaints. Left to the sidelines, her only option was to become best friends with the man of her dreams, hoping the tide would turn in her favor someday.
That day came when Emily, who was fed up with marriage pressure from her mother, finally pulled the plug on her relationship with Josh and promptly met the man of her dreams. Annie offered Josh a shoulder to cry on, and the two of them realized there was already a lot more than friendship between them.
...didn't turn out how you had expected?
But when you're in love with your sister's ex, the road to happiness is never smooth, even when he loves you back. Before they can get their happily ever after, Annie and Josh will have to contend with anger, resentment, accusations and secrets. And that's from the people who believe the best of their situation. Never mind the naysayers who believe the worst.
When a family crisis brings a familiar face back to Annie's orbit and wedding planning dredges up a past Josh would rather forget, the challenges get bigger and bigger. Will their love survive the pressure and last a lifetime? Finding love after five years might just be the easiest part.