Book It's Not Me, It's You — Alex Light

“Jackie Myers is a fraud. Or she could be a genius - the jury is still out.
The fact is, she secretly runs a viral account dedicated to breaking hearts and ending relationships... And she just used it to end the perfect relationship of her insufferable eternal enemy.
Wilson is the buttoned-up, Type A assistant manager from her nightmares, but it turns out he's also probably a really great guy.
So, with her conscience (and paycheck) on the line, Jackie decides there's only one thing to do: she's going to help Wilson get his ex-girlfriend back. Which should be easy, considering Jackie hates him... right?”