Chapter 1

On our sixth wedding anniversary, another woman unlocked my front door with a key my husband had never told me existed.

The lock clicked.

Before Nathan or I could move, the heavy oak door opened and Tessa Blake walked in, dragging a silver suitcase behind her.

Ten seconds earlier, Nathan had been holding my hand across the table.

He had cooked my favorite meal, trimmed the lilies himself, and opened the wine we had saved since our honeymoon.

"Just you and me tonight," he had promised.

I had believed him.

But now, Tessa walked in.

She didn't look the least bit awkward about interrupting a private anniversary dinner.

"Whoa, look at you two!" she said, kicking off her sneakers.

She didn't grab guest slippers.

Instead, she slid her feet into a pair of Nathan's old college team slippers. They had been sitting by the shoe cabinet for years, an unspoken reservation just for her.

Tessa left her suitcase by the entryway and walked straight over to our dining table.

She stepped right behind Nathan, resting her hand casually on the back of his chair. She stood so close her sleeve brushed his shoulder.

"Candles, steak, the good wine. Fancy." She waved her free hand dismissively. "Don't mind me, guys. Pretend I'm invisible! My apartment flooded."

Nathan's thumb stopped stroking my hand.

"Claire, her pipes burst," he whispered across the table. "It's a real emergency."

I didn't look at his pleading eyes.

I looked at the silver key dangling casually from Tessa's index finger as her hand rested on his chair.

"Tessa, how did you get in?"

She blinked. "With my key. Nate gave me the new one yesterday."

She glanced between us and finally seemed to notice my expression.

"Claire, come on. I’m not some random woman sneaking into your house. I’m Nate’s bro. I need a bed for one night, not your husband."

I looked at Nathan.

Four days earlier, someone had tried to break into an apartment downstairs. Nathan and I had replaced our lock with a high-security system. Every key had to be cut and registered again.

"She works near the hardware store. I gave her the spare." he admitted.

"You gave her access to our new lock without telling me?"

Nathan frowned.

But before he could answer, Tessa leaned forward, her hand still gripping the back of his chair.

She slipped into her breeziest, most innocent tone.

"Claire, don't overthink it," Tessa chimed in. "I've had a key to every place he's ever lived since high school. We're just bros. Honestly, if something were going to happen between us, it would have happened a long time ago."

Again.

During six years of marriage, Nathan and I had changed four locks.

Every time, he made three keys.

One for himself.

One for me.

And one for Tessa.

She wasn't an ex-girlfriend. She was Nathan's "bro."

They met in high school, long before I was in the picture. She wore hoodies, drank beers with the guys, and prided herself on being drama-free.

Because of that "bro" status, she always got a free pass.

That word excused everything.

Walking into our home without knocking.

Sleeping in our guest room whenever she pleased.

Leaving clothes in our closets.

Calling after midnight.

Taking Nathan away from dinners, weekends, and plans he had made with me.

Whenever I objected, Tessa gave me the same amused look she was giving me now.

I looked at Nathan.

I waited for him to respectfully ask her to step back, to tell her that this was our home and she couldn't just brush past his wife's boundaries.

Then Nathan gave me the same answer.

"She’s right. It’s just a spare key. It makes things easier. Don't ruin tonight over nothing."

Behind him, Tessa gave the chair an affectionate pat.

"I’ll get out of your hair," she said brightly. "Pretend I’m invisible."

She picked up her suitcase and rolled it down the hallway.

She entered the guest room without asking which door it was.

She already knew.

Nathan reached for my hand again.

I picked up my plate before he could touch me.

"Claire."

I carried both untouched steaks into the kitchen.

He followed me. "What are you doing?"

I wrapped the food, returned the wine to the cabinet, and walked back to the dining room.

Then I blew out the candles one by one.

"I’m ending dinner," I said.

"Because Tessa needs somewhere to sleep?" Irritation sharpened his voice. "Why do you always have to be so insecure?"

I didn’t say anything.

Then, from the hallway, Tessa called out, "Nate, where do you keep the clean towels now?"

He turned toward her voice automatically.

That was my answer.

For six years, I had kept trying to protect our marriage by closing one door after another.

And every time, my husband had quietly made her another key.