Him saying he found his destination could mean a destination for himself to grow as an individual, not the destination where the 2 MLs are heading. He specifically said he’s not returning to the past. He assured Jo that he shouldn’t worry because he is moving forward, not backward and that made Jo smile despite his heartache, because what truly mattered to him was Ian’s growth and forward progress, with or without him.
Yes, I think what “destination” meant here was figurative, as if he had finally found his own life goal or purpose. Ian choosing to live independently in his new life, free from the negative feelings/thoughts , toxic patterns and toxic people from his past. He’s starting over on his own for the sake of his growth and healing, not defining himself through either of the two MLs. After his near-death experience, his memento mori tattoo may also carry a new meaning. Instead of “Remember you will die,” it becomes “Remember you are alive.”

Just saw spoilers/ raws of ch 97 … idek what to say Ian is moving backwards instead of backwards, I guess its kind of realistic in the sense some people don’t want better for themselves ans prefer to stay in sticky situations. Disappointed in Ian.