maybe he passed her on the street? she was a street guitarist for a while trying to make money before she landed in rehab. she was a bit of a drifter and a junkie but i think it'd be cool if they sort of struck up an acquaintance of sorts/him stopping by and saying hi every once in a while and when she disappeared, he kind wondered what happened. if you're up for it, if not we can definitely think up something else.