@IRFRANK,
Well, we've all been thirteen. When I was thirteen, a good school friend had a crush on some guy. Well, first on Elvis Presley, but also this specific boy, and she cadged me into walking with her by his house some distance away, say a mile, 12 or so blocks - I remember thinking, huh?, but going along. Nothing happened. Perhaps she was more advanced than I was, since I didn't get the Elvis thing. Not that I disliked him, I just liked different people.
Later, in a new city rather alone, I had my own weirdness, falling into my own particular take on fantasy football, since I had no actual contact with boys after we moved across the country. Time passed and issues resolved.
A long time later, past 21, a close friend (still, now) went out of her wazoo when her first lover messed around with someone else. She wrote in lipstick all over his windows some dark but not stormy night. But she was, as I was, sort of inexperienced in all these matters, in that we had had little experience with boys, much less boys growing into men. We had both caught up but were not at all savvy. She had actually been in the convent as a postulant, whereas I backed out. She said they dismissed her because her walking was too loud; maybe not for that reason, but I trust her memory of how she was aggravating the upper women, by being herself. I knew her before and after the convent, as we worked after school at the same hospital, and she walked like all the rest of us.
So, somewhat I get all this. And I get that equestrian keys in and hangs on.
I also take it as having the ingredients of obsession and starter stalking, and that is not new.
I figure there is a situation I don't know and is none of my business. Maybe I'd be reaching out if I were her too.