There's writing advice that says that if you write something you love but it doesn't suit the narrative you should cut it. It's called "kill your darlings." The narrative arc that Jon follows is All about whether you should give into the temptation to do things that you desperately desire even if it harms others. His arc is a question about how far are people willing to go to survive. His arc is a tragedy about losing bodily autonomy. About what happens when you lose your ability to make own choices. What happens when your choices either harm you or others. Martin and jmart do Not make narrative sense.
Martin is only ever written as pitying and infatalizing Jon. Jmart is treated as if these two star crossed lovers finally found each other but the text just doesn't support that. They would be interesting if they actually acknowledged and leaned into the horror of only having solace with someone who sees you as a recovering monster rather than writing them as wholesome beans who try their best to be "healthy", whatever healthy actually means. Jmart would be interesting and thematically relevant if Martin was portrayed as the opposite of Elias. Someone who believes he knows what's best for Jon so he must take Jon away from Elias at *any cost*. Jmart would be interesting and thematically relevant if it was portrayed as Jon choosing to defang himself even if he was miserable because it feels better than if he followed through with the Web's plot or Elias'. But instead we just get this tonally jarring, nonsensical and frankly dull as rocks story of two people who never got along to suddenly being romantically interested to "honeymooning through hell".
Jmart doesn't serve the narrative. They are why we tell writers to kill your darlings.