She has long since stopped trying to predict when he would return to her.

He's simply too unpredictable, his thoughts too volatile and his behaviour too spontaneous; exhausting to chase, let alone catch. (Not that she would try; she knows all too well that he becomes overly anxious if made to stay still for long.)

She doesn't mind, though: she knows that he will, one day, come suddenly back into her life as easily as he had seemed to leave it, and she would be there to welcome him with open arms upon his return.

(After all, they are bound to one another, linked, drawn together as naturally and inexorably as magnets.)