The Matchbreaker Summer — Annie Rains

A pitch-perfect summer camp rom-com about two teens with nothing in common who come together to help break up a romance and unexpectedly start one of their own...

Sixteen-year-old Paisley Manning has been attending Camp Starling since she was a little girl, when her parents ran it together. For the last few years, since her father's death, she's been the one helping her mom run the camp behind the scenes. This year, however, will be Camp Starling's last hurrah because Paisley's mom has met a guy online and they're getting married.
 
Enter Hayden Bennett, who is working alongside Paisley. Paisley and Hayden are like oil and water. She follows the rules, and he seems to live to break them all. But when Hayden catches wind of Paisley's predicament, he has an idea. If a matchmaker in some computer algorithm caused the issue, a couple of real-life matchbreakers can fix it.
 
As they work to break up the happy couple, Paisley discovers that maybe Hayden's not so bad after all. Has she met her own perfect match in her fellow matchbreaker?