Maybe it's Clalec instead

What are you doing Clary?

Alec Pov-
The institute has always remained a constant for me, the one thing that I could always lean on. But ever since Clary arrived, something has shifted. I grip the railing until my knuckles go white, looking out over the library of the institute in a small secluded balcony. A small frame with red hair sits on the couch. She looks  different, her body language, something's off. Watching her, I feel myself lean in her direction, yet she has no idea I'm here.

She takes out a dagger and holds it between her legs as she looks at it. Her entire body shakes as she draws in a shakey breath and takes out a note from her pocket. She sets it on the table, even from my position I can see her hands shaking. What is she doing?

She hasn't quite let go of the folded paper yet but as she did, she put both hands around the small knife. The blade towards her stomach Clary no. I sucked in a breath, it sent panic through my veins.
"CLARY NO!" I scream. She cannot do this. Maybe I haven't been the most welcoming but she cannot kill herself!
She grips the knife until her hands go white. My legs refuse to budge. It's like I'm stuck watching. After a second she lets the dagger fall to the floor. Thank the angel.

But then jumps up at lightning speed so I chase after her, the bruises around my rib area making it hard to run properly. As soon as I am on the same floor as her, there's no trace of Clary, only the dagger she left behind. Damn it Clary.

Frantically I race in the direction she went and whip my head around but she's gone.
"Clary!" I yell again, just maybe she'll hear me. My heart is racing at an unusually fast rate, I'm normally fine when it comes to running. Must be my injuries. Nonetheless I take off, running around for a couple blocks but no luck.

Hopefully she's at the institute.
"Izzy!" My breathing not yet normal, " Is Clary here?"
"No why"
"She's disappeared " I have to look away from Iz when I say this or else she'll think I like the mundane.
"She what?"
"I saw her, in the library, she was going to kill herself. I yelled at her to stop but before I got a chance to go to her she ran out the door."
"Crap"
" I mean she's done this before. Ran off, then come back because she's reckless." But nervous sweat trickles down my back because she usually doesn't run off under these circumstances.
"No Alec, about two hours ago Valentine was spotted in New York. " Izzy tells me. She looks worried, I mean she should be. But it only increases my heart rate and palms become sweaty.
Are you kidding me! "I-" but all I can do I hit the nearest lamp off the table, satisfied with the glass shattering.
"Alright so we need to find her and alert other shadowhunters to be on the look out. Call Jace and have him meet us here now."  I fall back to my usual rule following, calm persona. I had to or else I might explode this time. What is it about this mundane shadowhunter?