Again Rachel by Marian Keyes

Back in the long ago nineties, Rachel Walsh was a mess.

But a spell in rehab transformed everything. Life became very good, very quickly. These days, Rachel has love, family, a great job as an addiction counsellor, she even gardens. Her only bad habit is a fondness for expensive trainers.

But with the sudden reappearance of a man she'd once loved, her life wobbles.