Protected By The Soldier Tiger by Meg Ripley

He gave his tigress a ring, then walked out of her life without a trace.
Now it’s his duty to protect her.
The skills Max learned as an Army Night Stalker secured him a civilian job as a helicopter pilot, but job or not, he’s still a tiger wrestling with the horrors of what he’d been through on active duty. He decides to join the Special Ops Shifter Force to keep his mind busy, and soon, he’s assigned to guard the prime witness of a shifter murder trial. But just his luck, that witness happens to be his ex-fiancée.
Sabrina has become Dallas’s top cosmetic surgeon, but her plans take a sharp turn when she finds the Alpha of a prominent bear clan dead. With a target now painted on her back, her local conclave hires a full-time bodyguard to protect her. But when she steps into a helicopter and sees the tiger who’d skipped out on her right before their wedding, suddenly Max is the one in need of protection.
Despite the pain, anger, and resentment Sabrina feels, she’s stuck with Max until the trial. Will their turbulent past dictate their future, or has fate reunited these two big cats for a second chance?