Rush Turner by Susie McIver

Hero; Rush Turner — former Navy SEAL (or high-security protector, depending on your continuity). Known for his patience, steady calm, and the fact that nothing rattles him. Except maybe a woman who points pepper spray at his face while he’s trying to be helpful.
Heroine: Jessa Monroe — a fiercely independent woman with trust issues. She’s witty, suspicious of everyone, and armed with more personal defense gadgets than the average secret agent. Her car battery dies on a deserted back road — and her paranoia says, Great. Now I’ll be kidnapped by a serial killer named Rush.
Spoiler: he’s not a serial killer. Just her future happily-ever-after.