the only thing that changed about him is his physical form, he's still the same. he didnt change himself purely for her, this has been something he wanted way before he met her. yes she played a big part in him wanting to be human but he didnt ask to be human for her only. yea i get it if shes hurt and sad but to be scared/disgusted??? like why? bc he changed himself to a human? but his personality is the same? if the author was trying to show that she loved him bc of who he truly was, why would it matter if he was a lion or a human? his lion form isnt his true self anyways, if we're talking about truly loving someone, then its their soul. to me it just seems like shes into his beast form. which i wouldnt be surprise about, i mean the girl got turn on bc of his beast form and when he was fingering her in his human form, all she was thinking about was his his lion tongue that could reach further in her like wtf lmaoooo, this just makes it seem that she fell for him ONLY for his beast which ik wasn't true since she also likes his kindness but I feel like her reaction didnt fit for it sorry for the long ass paragraph lol
She fell in love with him because he was a beast not because he was a human. She loved him the way he was and yet he changed because he felt insecure about not just the way she looks at him but everyone. That's got to hurt. You love someone because of who they are, not the person that others want them to be.
I'd be scared as well.