I don't like the idea of Logan as as addict, even tho you specifically say he is not. But I can certainly understand the fight, given his possible age, against the feeling of having no control. So many long years, even if he looks only 30-ish, of fights and battles and events that would probably kill a mere mortal, yet he is impervious. And she is the only one that could possibly understand.  It fits, it's sad, but it fits.