Just for the Summer by Abby Jimenez .

Just for the Summer by Abby Jimenez is a bestselling, emotionally resonant contemporary romance that balances laugh-out-loud humor with heavy, real-world emotional stakes. It is the third book in her Part of Your World series, though it can be read as a standalone.

Premise
Justin Soto is a traveling nurse tech who has a bizarre, viral problem: every single woman he dates finds her soulmate the minute they break up with him. Dubbed the "cursed boyfriend" on Reddit, Justin is entirely over modern dating and just wants to be left alone.

Enter Emma Rozati, a trauma nurse living in Minnesota who has a shockingly identical curse: every guy she dates finds the love of their life immediately after dumping her. When Emma stumbles across Justin’s viral internet thread, she realizes they are the ultimate match. Their logic? If they date each other briefly, the curse will cancel out, and they can both finally break the cycle.

They agree to a strict, no-strings-attached "summer fling" to break the hex. But when Justin flies to Minnesota, their chemistry turns out to be entirely too real, and their casual experiment quickly spirals into something much deeper than either of them planned.