Crash Into Him by Sasha Wexler

Twenty years after he broke her heart into a billion mismatched pieces, Nicole and Gabe have stumbled into each other again. They’re older. They’re wiser. And Gabe knows that throwing Nicole away was the worst mistake he ever made.
But it hurt…so bad.
Gabe is everything Nicole wants and needs, but if she can’t figure out how to forgive him, she’ll have to walk away from this second chance at first love.