<P> In City of Lost Souls, Simon loses his Mark of Cain to the Angel Raziel in exchange for the sword "Glorious" to save Jace by separating him and Sebastian . Throughout the book, Simon and Isabelle's relationship progresses to the point where she trusts him enough to let him bite her when he is hungry . They spend nights together, much to Alec's horror . However, they still don't consider themselves dating for neither has confessed that they want to . Simon thinks he will just be dumped like the rest of Isabelle's boyfriends while Isabelle has trouble revealing her feelings and thinks Simon should make the first move . </P> <P> In City of Heavenly Fire, Simon admits his love to Isabelle . Throughout the book, Simon follows Clary and Jace--along with Isabelle and Alec--into the demon realm Edom to defeat Sebastian and find Magnus, Raphael, Luke and Jocelyn . In the demon realm, he saves Isabelle after she is bitten by a demon . Soon after, he tells Isabelle he loves her . As a result, they finally make their relationship official . At the end, after defeating Sebastian, they have no possible way of getting out . Magnus calls on his father, Asmodeus, who asks to help them get out of Edom since Sebastian closed all possible ways for them to get out . In return, Asmodeus wants Magnus' immortal life--if Magnus does this, he will die . None of them want Magnus to sacrifice his life, so Simon steps forward . Because Simon has only just become a vampire, his years will not catch up to him and he will return a mundane . But to spice up the deal, Asmodeus also says he must take away all of Simon's memory of the Shadow world and of Clary . Everything he will remember will be a normal life, a life without Clary, or Jace, or Alec, or Magnus and Isabelle . This devastated them all, but Simon gave it willingly to save his friends and the person he loves . In the Epilogue, Clary tries to see if Simon remembers her, but he doesn't and just thinks she's a crazy girl with tattoos . Except, he does give her his band flyer thinking she might be hitting on him . She walks away with it . Clary gives Izzy the flyer and walks away . The flyer says the band's name, "The Mortal Instruments". With this sliver of hope, Izzy and Magnus go to Simon and tell him what has happened . Simon is given the choice for Magnus to prep him to Ascend and become a Shadowhunter so that Asmodeus cannot touch him and he can regain all of his memory . Simon agrees and receives some of his memory back . He then reunites with Clary, Izzy, and the rest of the clan at Jocelyn and Luke's wedding . In Tales From the Shadowhunter Academy, Simon trains as a shadowhunter and becomes Clary's parabatai . </P> <Dl> <Dt> Love interests </Dt> </Dl> <Ul> <Li> Isabelle Lightwood </Li> <Li> Maia Roberts </Li> <Li> Clary Fray </Li> </Ul>

The mortal instruments who does clary end up with