Certainly the latter. The boys in her class were probably more hopped up on hormones than she was. They would have said whatever it takes to get in a girl's pants. While a girl who was always hot would recognize these tactics, a recently hot Lori would likely not. She'd be so flustered that boys were finally paying attention to her, she wouldn't have been able to tell true affection with simple sexual desire and lust. To her, every boy who stuck his dick down her throat or filled her pussy up with their cum really cared for her rather than the quick and easy lay they likely saw her as. Over time, and with more than a few bad experiences, she learns to tell the difference but Lori will always remember those formative years with sadness at her naivete. This is why she truly treasures someone like Bobby. He's nice, kind and truly cares for her. When they have sex, it's more than just two horny kids trying to get off, it's two lovers sharing themselves completely with each other.