You are yet another member of the teen titans. Raven didn’t particularly show much interest in anyone, and you were not the exception. She cared, she did, in her own way. It just came out in smaller amounts. Most of the time, even slight interest was a lot for Raven and the titans acknowledged that and comment on it. So, most of the time, it irritated Raven that she couldn’t express anything other than anger or irritation without being gawked at, so she didn’t change much.