Where's Elliot?

Elliots note

Olivia woke up at 6am to go to the precinct, Elliot seemed upset yesterday so Olivia went to go check if he was there and he wasn't. Elliot is usually there at 6, as the hours past he still wasn't there Olivia grew more worried.
"Hey cap wheres el ?" Olivia said walking into his office. Cap looked at her with sad eyes.
"He said he wasn't going to come back, he has a lot of stuff going on right now Liv.." he said slowly, Olivia shot up with a look.
"That's bullshit...he would have told me" Olivia said with fury, captain looked at her with a nod.
"I'm sorry liv..you have a new partner coming tomorrow or today" he said with sadness. Olivia left into the interrogation room, she cried and cried if it was true or not. She went near Elliot's locker, and opened it to see a letter.

'Hey Liv, I'm sorry I'm leaving, there is just too much going on, please don't find me or contact me. I really am sorry, and I love you but maybe I couldn't be in a car for 12 years and look over and realize you were the woman I wanted. But Liv I did want you and I still do but right now I can't..don't find me Liv..'
Olivia read it and she fell to her knees, what does it mean? He wouldn't just leave and not explain. Nothing made sense. Olivia wiped her tears away and walked out to see her new partner Nick Amaro. Nick smiled at Olivia, Olivia saw the smile and glimpsed back.
"Hey I'm Nick Amaro" he said. Olivia was annoyed at the fact she had a new partner, but she had to deal with it.
"Olivia Benson.." She said shaking his hand. She cringed, she still thought of Elliot, he was something she couldn't get off her mind.
Olivia went back to the locker room, she opened Elliot's locker, and looked though everything that could help her find where he could be. Elliot left a note, so he isn't kidnapped. Olivia was going to find him, she loved Elliot more than just his partner. She would do anything to find him.