This is pretty aberrant behavior for any well-adjusted human being.

That said, there is every possibility that he is not a well-adjust human being, and possibly even malignant in nature. It's possible he orchestrated events to cause pain and distress, and going 6 hours out of her way would not only cause him satisfaction, but give him opportunity to be even more outlandishly hurtful. Or worse.

There are some sick people out there, and when a red-flag pops up (say, an extreme demonstration of maladjusted social behavior) it should be taken as a sign that you may have been dealing with just such an individual. It's best to stay safely far away and be glad you came through (relatively) unscathed.

If it helps your friend restrain herself, point out that a lack of any further reaction on her part is almost certain to prompt some half-assed attempt at getting back on her radar in the not-so-distant future (hopefully after she's had time to get over it, throw up walls, and continue to deny him any satisfaction he might be after).