It’s a Wonderful Lie by Wren Michaels

He was sent to save her life, but ended up losing his heart, memories, and clothes.

Eden Credere should be in Barbados with her new husband. Instead, it was like she married Murphy and his law was ruining her life. She’d lost her dad, her job, her best friend, and her fiancé. After drowning her sorrows with rum and eggnog on Christmas Eve, she takes a tumble in a tree lot with a Douglas Fir, sending Eden over the edge.
Theliel has watched over Eden her entire life, from her first steps to her latest, where she took a dive in a tree lot. He’s always been there to save her, and this time should have been no different—until it was. As her guardian angel, he’s not supposed to be seen, but one corporeal slip-up later, and he’s got a lot of explaining to do.
As Theliel works to convince Eden why the world is a much better place with her in it, he finds himself the one falling, and it’s Eden who catches his heart. In a twist of fate, Theliel must not earn his wings, but his humanity by convincing Eden they’re meant to be together.
The only problem is neither of them remember who he is when he wakes up on Christmas morning in a snowbank with no memories and no clothes. With the magic of Christmas in the air, love in their hearts, a vision of yoga pants, and maybe a little help from their “friends”, all they have to do is believe.