"What's going on with you? Why are you acting like you're hiding something?"

"You should go," she repeats.

Before she can convince him to leave, someone else is knocking at the door. A knot forms in the pit of her stomach. She slowly moves towards the door. She opens the door. Nick stands there, looking at Brian. Olivia excuses herself, and steps into the hallway. She closes the door behind her. Nick strains to hear their conversation from the other side of the door.

"Now is not a good time," Olivia tells him.

"What is he doing here?"

"He is just trying to be a good partner."

"How?"

"He wanted to warn me that you have a kid. He didn't think that I knew."

Brian rolls his eyes. "Call me later."

"Ok," she agrees.

He heads back down the hallway, towards the elevator. She returns to the apartment. Nick stands there, looking at her.

"You want to tell me what's going on?"

"My personal life is none of your business," she warns.

"Really?! Olivia your personal life brought details of my past that nobody knew. How is it ok for you to know all the details of my personal life, and me to none of yours?" he raises his voice.

"Lower your voice," she warns.

"I get one step closer to getting to know you, to getting to understand you, and then you put up a wall. I am your partner, how am I supposed to have your back, when I don't even know where you're coming from? I don't even know if I can trust you."

"Of course you can trust me."

"Can I? You're hiding something."

"Nick, please," she begs. "Can we talk about this later, when you are a little more calm?"

"Fine," he rolls his eyes, and storms out of the apartment. He slams the door. She locks it, behind him.

She sinks onto the couch, and flips on the TV, in disbelief. She knows that he's right. And she knows if he knew he would understand why she can't tell him. She flips through commercials.

Things between them are tense the following morning. They have a suspect in interrogation. Cragen waits for them to start. Olivia looks at Cragen.

"Can you get him started?" she asks her boss.

He throws her a questioning look.

"My partner, and I have something we need to discuss, before we can go in there, as a united front, and get him to talk."

"Of course," Don nods, in understanding. He heads into the interrogation room. Olivia makes sure the speaker is off. She looks to her partner, whose nostrils flare.

"Nick there is something that you have to understand."

"What is that?"

"I am not trying to shut you out."

"Really, because that isn't the way that it seems."

"I am not asking you to understand."

"What are you asking me?"

"You can trust me. I have your back."

"But there are some days that I don't even feel like I know you."

"I know."

"We have been partners for a while now, right?"

"Yeah," she nods.

"So why don't you trust me?"

"I do trust you. I trust you with my life."

"Then why can't you tell me what's going on with you lately?"

"Because I can't."

"Why not?"

"I can't tell you that."

"You told your old partner everything, didn't you? The two of you were close. You knew everything there was to know, about each other. Olivia, I am not him. I am not going anywhere."

"I didn't tell him everything either," she reveals.

"You told him, when something was bothering you."

"We were good partners, but that doesn't mean that we told each other everything. And, we certainly didn't get along all of the time. We didn't always see eye to eye."

"There is just one question that I have."

"And what's that?"

"But I don't want to offend you. It isn't my intention to offend you."

"Just ask it."

"I just want you to know that the only reason I am asking, is because..."

She cuts him off, "Just spit it out?"

"There is something that you said, that really bothered me."

"What's that?"

"You said that he deserved a second chance."

"Everyone does."

"But as far as I can tell, he didn't do anything to earn it. He didn't suddenly become some other, better person."

"You're right, he didn't. He wasn't some one else, all of the sudden."

"So what did he do to deserve a second chance from you?"

"Sometimes people earn second chances, sometimes you give them second chances, because you fear you may have rushed to judge them."

"So you rushed to judgment the first time?"

"I misjudged him."

"I don't buy it."

"Sometimes you just have to do things, because you feel obligated to, and for no other reason," she admits.

"Ok."

"I don't want to talk about this anymore."

"Ok, so can we interrogate this guy, now?"

"Yeah," she agrees.

They enter the room, and Don leaves it. He doesn't ask them what was said. He knows what goes on between partners is sacred, and doesn't always need to be discussed. He doesn't question if they're ok. He just lets them do their jobs. It results in one of the best interrogations that he's seen in a while. Their suspect confesses in less than an hour.