Okay, go easy on me because this is only my second fanfic. The Mortal Instruments do not belong to me. Warning: I am planning to have some plot twists in here. Classic Jace cheats on Clary fic, but I'm going to prewrite mist of it so it WILL get past five chapters, unlike the others. Now, let's get started.

Clary's POV

I walk into the institute, just coming back from my mom's and Luke's place. It has been six months since we have defeated Sebastian. In my opinion, things have been going well. Luke and my mom are married. Simon is always out with Izzy. Magnus seems okay with Alec. Alec has become far friendlier to me than when we first met. Plus, Jace and I couldn't be better.

When I first walk in, I don't see anyone, which is not unusual, for everybody is usually out and about. I walk into the kitchen where I see Alec.

"Hey, have you seen Jace," I ask.

He gestures towards the rooms. "I believe he is in his room. If not, check the training room."

I smile at him. "Thanks."

I run off towards his room. I'm about to knock when I hear a female voice coming from it.

"Wait," she says. "Are you confident she won't find out?"

The next voice I hear shocks me.

"Kaelie, if there is anything I learned from Clary by the last year or two, is that she is very loyal. Trust me, she wouldn't think I would be doing this," says Jace.

I hear her sigh. "Do it."

I will never forget what I hear next. Moaning, the bed rocking, their voices filled with lust.

Only knowing I had to leave, I bolt. Straight into Alec.

"Woah, you must be more careful Clary. We wouldn't want you to run into demons now would we?" he says, joking.

Instead of replying, I start sobbing. Instantly, his arms wrap around me and pulls me against him. I cry into his shoulder while he pulls me into his room. We sit on his bed for minutes, doing nothing except for me crying. When I start to calm down he whispers.

"What happened?"

I shake my head. "I don't even fully understand it yet. I was outside Jace's bedroom when I heard voices coming from it. Jace was-is cheating on me. He's having sex with another girl as we speak," I mutter the last part before Alec gets up. Before he opens the door, I run to block it. "No, I don't want him to know yet. I don't want anything else happening," I rush.

"He cheated on you, Clary!" His voice is rising.

"Please, Alec," I beg.

He resents. "Fine, just head to your room and give yourself a couple minutes to calm down. We can talk about it later. All of us."

I nod and leave his room. Once I enter mine, I close the door. I sit on my bed for a few minutes before I head to my closet and start packing. I can't stay here any longer. I pack most of my belongings into one suitcase and rest my hand on the doorknob. Before I open the door, I turn back. Everybody would be perplexed if I left without telling them. Well, everybody but Alec, though he would still want a good explanation.

I write a letter for everybody I could think of. Alec, Izzy, Simon, Magnus, Mom, Luke, even Jace. Jace's I made short and blunt, but I put a short explanation in most of them. I tell Alec to try and delay them at least from looking for me. I wrote that I loved them and that they should not look for me. I sealed all of them and put them neatly on the bed.

Then, I snuck into the hall and peeked into Alec's room. He is no longer in there, good. I gently placed his letter on his pillow and silently thank him for being there.

Once I returned to my room, I grabbed my bag and used a portal room. I aim for the London institute. I've never traveled this far by rune. In Sebastian's house, sure, but by rune I ended up outside of Idris last time. I take a deep breath and walk through.

I find myself on the steps of the London Institute. I slowly walk up and knock on the door. A dark brown haired girl about my age opens it. Immediately, she gasps.

"Are you Clary Morgenstern?" she asks.

I'm surprised. "Yes, how did you know?"

"You are like a celebrity in the shadow world!"

"Oh, is there like a place I can stay for a while? I am kind of in a situation."

"Of course, you can stay here as long as you like." She extends her hand. "I'm Angelina."

I shake it. "It's a pleasure to meet you."

Then I follow her into the institute, not knowing what is going to happen.

The institute looks bigger than the New York one. We walk down some halls, and I am assuming we are heading towards an office. We turn a corner and I immediately crash into something hard. I fall onto the floor and look up. Apparently I just ran into someone my age. He has messed up brown hair, but he does not look happy right now.

"Hey! You might have to watch where you are going," he says. He looks at me and does a double take. "Who are you anyways?"

I roll my eyes and stand up. "I am Clarissa Fairchild, Morgenstern, whatever you want to call me."

The next look made me suppress a laugh. He looks like he just got slapped in the face. "Oh, wow. Uh. I'm sorry about that. I am Nathaniel but you can call me Nathan."

This time I laugh. "It's okay. You can call me Clary."

Angelina pulls me along the hall, keeping me on track. Once we arrive at the office I see a tall woman standing, hunched over the desk. Her straight, blonde hair blocks most of her face from sight and her eyes are focus. Angelina clears her throat and she looks up. Recognizing me almost instantly she walks around the desk.

"Welcome to the London Institute. I am Nicolette. I run this place. You, correct me if I am wrong, are Clarissa Morgenstern."

"Yes I am, but I prefer Clary. I came from the New York Institute."

She nods. "Well, you can stay as long as you need."

"Thank you. I am planning to stay for a while."

She gestures towards a chair and then sits behind her desk. "What brings you here if I may ask?"

I take a deep breath. Should I tell her? "Let's just say I'm hiding from something, and I hear that this institute is very well hidden, even if it is in a very popular city."

"What are you hiding from?" she asks.

"It might be easier to tell everybody at once," I say, not ready to tell anyone yet.

She stands up, and I follow. "I understand. Angelina will show you to your room."

We walk towards the door and into the hallway where Angelina is. I didn't even notice that she left the room.

We walk down one of the many corridors and she points to a door.

"This is my room, so if you need me come here."

Three doors down is my room. I walk in and collapse onto my new bed. Everything has happened so fast. I don't even know how to comprehend anything anymore.

A couple days ago I would have spilled everything to Simon or Izzy, or even Alec. Magnus would have comforted me. Now, I am all alone. Here though, I can start over. There are not any bad memories here. I can just start anew and have an actual life here. Sure, I will miss my friends, but I will make new ones here. I ponder over this new concept as I drift off to sleep.

Again, second fic ever made. I don't really know what I'm going to do for this one so… Let's all hope it turns out good.