Idea: Jon and Martin have eachother but they're still lonely -> Martin's Lonely aspect is showing -> Martin WANTS to be alone and he also wants Jon to stay with him -> Martin purposely isolates Jon from everyone else so that Jon has to stay with him, can only stay with him.
Martin's Lonely aspect should've been highlited more in season 5 instead of just being a vessel/medium for his angst. He should've been shown as more monstrous pleeeease. His relationship with Jon should've been portrayed as more supernaturally unhealthy. Hurting people is not always physical, and you're not always aware that you're being hurt. The Lonely would've been so cool if it were also shown as a weapon, as something that can hurt you just as much as the Eye's compulsion. Not just as a tool for Martin's character development. The harmful isolation motif should've been maintained in season 5 as well instead of being discarded for the sake of the human-monster dynamic.
Every day I mourn monstrous Martin. They could've been so much better auuugh.... AND it could've made Martin drop the weird superiority thing he has over Jon in s5. That or he would become the ultimate hypocrite (tasty)