Forever, Never, After by Nicola Jane

Megan thought Dan was her forever. Ten years together and a three-year-old daughter meant they were pretty much settled and happy.
That is until Dan gets attention from one of his university students.
Ashley is used to getting what she wants, and she sets her sights on her married lecturer, stopping at nothing to make him hers.
She’s beautiful, flirty, and daring, everything Dan didn’t think he needed until one night with Ashley makes him re-evaluate his life and, most importantly, his marriage.
When Meg’s world falls apart so unexpectedly, she has no choice but to face life as a single parent, something she never expected to be.
Can she move forward while being forced to watch her husband move on?
And what happens after the thrill of the affair becomes less exciting?
Four lives are brought together—and torn apart—in a story of heartbreak, happiness, and love.