Ian needed someone to depend on and once Tj was there, he never pushed him back even when things were too much bcs he loved him, yes, but also bcs he is extremely lonely. His only family died in prison after he called the cops and deep down he thinks that he's guilty of her death.
Also he got abandoned by everyone he thought he was close to in the time when he needed the most support and care.
Ian tried to love again and followed the one he loved down a path that slowly was turning him into a monster. He suffered a lot, I hope he will truly find peace and happiness one day.
So after this short analysis on my baby boy, I want to say that im kinda curious what is the meaning behind Tj going no contact with Ian. In the earlier chapthers we saw how much Tj wanted to bring Ian back into hell once again, so I'll patiently wait ^^