Nope, nope, just nope. The whole time she's fat, she's insecure as fuck. When she's thin, she's confident as fuck. He even shows her a picture of her fat ass, not a picture of her personality (her personality was never even portrayed except for her insecurity and self-loathing--yeah, suuuure, those things are so fucking sexy!). If this was supposed to be about her personality, it would have been presented. A storyteller isn't going to leave that out, it would be central to the theme. You're right that when she got thin she became somewhat deranged. This was shown, so it's part of the story. When she was a piggy, she saw everyone else making out, and that's what she wanted. What she didn't have was the experience of learning how to do it. She got a normal girl's body without a normal girl's experience. Here's the story: She was a pig. She had the hots for a normal looking guy who turned out to be a pigfucker. She was too self-conscious and had low self-esteem (as is proper for a pig of her stature) to notice this. He invited her to his party, he took a picture of her, he peeked at her during class and peered at her across the room at the party. He danced with her and tried to kiss her. HE WAS A MOTHERFUCKING PIG FUCKER. If he was into her "personality" (haha, teen boy into her personality enough to overlook her fat ass, but later when she's thin he turns her down? He tried to kiss her in high school. He would have happily done so in the bathroom), he would have been ecstatic to see she was also hot now as well! He would have congratulated here, and his cock would have been unstoppable. Instead, he was turned off from the moment he saw her human form. He showed her her pig form fondly. He didn't want to kiss her, he wasn't into her AT ALL anymore.