West of Forgotten — Lynda J. Cox

Banished from civilization to the Wyoming Territory, U.S. Marshal Harrison Taylor holds a deed to half the Lazy L. He isn't sure why his beautiful new partner, Rachel Leonard, doesn't trust him. He has to convince her he is nothing like the man who abused her and he must earn her trust before the escalating attacks at the Lazy L turn deadly.
For six years, Rachel has worked to repair a shattered life. Caring for her son and invalid father leaves little time to keep the Lazy L profitable. She doesn't want a business partner simply because her father gambled away half of her beloved ranch, and most certainly doesn't desire a husband. Unfortunately, she's stuck with the former and can't trust Harrison as the latter.
But unless she can learn to trust him, everything and everyone Rachel loves will be lost.