Luke and Jocelyn were friends when they were younger.
Jocelyn was married to Valentine, while Luke was his best friend and Parabatai. They were all members of the Circle together, but as Valentine became more ingrained in the Circle, Jocelyn and Luke turned to each for support and began to fall in love. Valentine grew jealous and conspired to turn Luke into a werewolf, breaking their Parabatai bond. Devastated by Valentine's betrayal, Jocelyn stepped in to save Luke.
After Jocelyn ran away from Valentine, Luke found her.
He left his life in Idris behind to follow her to New York. He became a father figure to Clary and an important part of their lives.
Luke tried to get Jocelyn to tell her daughter the truth.
Over the years he encouraged her to introduce Clary to the Shadow World. He knew that she would find out the truth eventually and he wanted it to come from her mother.
When Jocelyn was taken by Valentine, Luke lied to protect her.
He told the Circle that he had kept in touch with Jocelyn in order to locate the Mortal Cup. He was trying to protect Clary from her father.
After he challenged a pack Alpha to rescue Clary, Luke had a dream about Jocelyn.
She told him that Clary was the key to finding the Mortal Cup. Luke wanted to find a way to save Jocelyn, but she told him to focus on defeating Valentine instead.
Luke did everything he could to help Clary find her mother.
When they finally tracked her down he was so happy to see Jocelyn that it broke our hearts!
Luke even skipped the biggest event of the year to sit by Jocelyn's bedside.
Well, she was more hovering above the ground than sleeping in a bed. But he missed Alec and Lydia's wedding! That's a big deal.
And when Jocelyn finally woke up, Luke was right there to catch her.
His was the first face she saw and their reunion was beautiful!
Their family was reunited at last!
Including Simon. Obviously.
Then Luke found out that Jocelyn had been lying to him for years!
She didn't tell him anything about her son being injected with Demon blood, but he couldn't stay mad at her for long.
When the Clave ordered Jocelyn back to Idris, Luke decided to go with her.
He was so in love with her he literally couldn't imagine his life without the woman of his dreams.
And now Jocelyn is dead!
What will this do to Luke? How will he react? He just got her back; this is so unfair.
If you haven't seen the tragic end of S2E4, then you should watch it right here on Freeform! Immediately!
Tell us your favorite Lucelyn moment in the comments.